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	<title>www.qianqin.de &#187; computer</title>
	<atom:link href="http://www.qianqin.de/category/computer/feed/" rel="self" type="application/rss+xml" />
	<link>http://www.qianqin.de</link>
	<description>personal web site of Qian Qin</description>
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		<title>Old Notebook, Upgrade or not?</title>
		<link>http://www.qianqin.de/2011/10/20/old-notebook-upgrade-or-not/</link>
		<comments>http://www.qianqin.de/2011/10/20/old-notebook-upgrade-or-not/#comments</comments>
		<pubDate>Thu, 20 Oct 2011 00:18:48 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[hardware]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=726</guid>
		<description><![CDATA[My girlfriend has a Sony Vaio VGN-C2S/P notebook from 2007 and it is getting old and slow. So her question was, upgrade or buy a new one? Well, the Vaio was build with 4 years old tech, a Intel Core 2 Duo 1,6 GHz Dual core processor, 2GB of RAM, a 80 GB hard disk [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://www.qianqin.de/wp-content/uploads/2011/10/overview.jpg"><img src="http://www.qianqin.de/wp-content/uploads/2011/10/overview-150x150.jpg" alt="" title="Overview of all changes." width="150" height="150" class="alignnone size-thumbnail wp-image-728" /></a>My girlfriend has a Sony Vaio VGN-C2S/P notebook from 2007 and it is getting old and slow. So her question was, upgrade or buy a new one? Well, the Vaio was build with 4 years old tech, a Intel Core 2 Duo 1,6 GHz Dual core processor, 2GB of RAM, a 80 GB hard disk and only 2 USB ports. You can get a notebook like hers for €300 these days, but for a true performance enhancement, one would at least need an Core i3-2 or i5-2 processor with 4 GB RAM and 500GB hard disk, meaning at least €500. That&#8217;s not very cost-effective considering her old notebook still works perfectly, so I decided to upgrade it instead. Like with her <a href="http://www.qianqin.de/2011/09/28/high-waf-inductive-charging-mod/">Samsung Galaxy S</a>, the only condition is that no changes should be visible.<br />
<span id="more-726"></span><br />
First, I listed all changes needed:</p>
<ul>
<li>faster than a current €500 notebook</li>
<li>More USB ports (she has a wireless mouse and a wireless keyboard, which eat up both of her USB ports and make it impossible for her to plug in anything else)</li>
<li>3G HSPA Internet for browsing the web everywhere (tethering is for geeks eh?)</li>
<li>as cheap as possible</li>
</ul>
<p>Let&#8217;s start with the first problem: A computer is always as slow as its slowest component, which in a notebook&#8217;s case is the hard disk. A spinning 2.5&#8243; hard disk is slow, so that needs to be swapped for a SSD. As SSD are incredibly expensive, only the system partition should be on a SSD, as it shows the biggest improvement there. Pictures or videos which take up a lot of space should be stored on a normal magnetic hard disk, as those are cheap. So I need to make space for a second hard disk. Luckily, Sony uses a standardized IDE slim DVD drive, which can be swapped for a universal SATA to IDE hard disk cage. By exchanging her 80GB hard disk with the 320GB of her external drive and inserting a 96GB Kingston V+ 100 SSD, she will have ~400GB of space, which is more than enough. Next, I swapped her RAM with the RAM from my broken Toshiba notebook, increasing it to 4GB. With this combination, her notebook should outperform most current notebooks. As the Toshiba had a WiFi N card, I swapped it into her notebook, too.</p>
<p><a href="http://www.qianqin.de/wp-content/uploads/2011/10/hookup.jpg"><img class="alignnone size-thumbnail wp-image-727" title="Internal USB hook up" src="http://www.qianqin.de/wp-content/uploads/2011/10/hookup-150x150.jpg" alt="" width="150" height="150" /></a>The next two problems can be solved &#8220;relatively&#8221; easy with an internal USB hub. At least I thought so until I tried soldering it inside. Every single guide on the web showed how you removed a USB slot permanently to connect the hub, which is simply not possible in my case as that would make the mod visible. So I needed to find a different way. I found a user connecting his USB hub to a mini PCIe port, as it should contain USB data lines. Unluckily, the free mini PCIe slot on the Vaio didn&#8217;t have working USB signal lines, so I needed a completely new approach. Then I spotted the Expresscard slot, which is nothing else than an external mini PCIe slot. I checked the PINs and it did have working USB signal lines there, but&#8230; my girlfriend uses a SD-card reader in that slot which of course already uses those lines. The only solution now is to hijacking the signal line, connecting the card reader to the internal USB hub and the hub to the lines. Luckily, I found that both USB signal lines were connected in series with capacitors, giving me a clean pleace to intercept them. I installed a 4 port USB hub, connected her mouse and keyboard dongle in 1 of each port, a 3G HSPA stick in a third and connected the last port back to the Expresscard slot. Now the only thing left is to place everything so I can still close the notebook perfectly. Done.</p>
<p>So how fast is her notebook now? Well, it boots twice as fast as a brand new i5-2 notebook with a clean Windows installation. Every applications starts up way faster. Unless you decompress a file or do something really CPU intensive, the Vaio will feel faster than any €500 notebook. In fact, if you take 3G HSPA into consideration, a comparable notebook would cost €800. So how much did the upgrade cost?</p>
<ul>
<li>Kingston 96GB V+ 100 SSD (€100)</li>
<li>320GB hard disk (€35)</li>
<li>3G HSPA stick (€20)</li>
<li>WiFi N mini PCIe card (€20)</li>
<li>Universal HDD cage for slim-drive (€15)</li>
<li>2 GB RAM (€15)</li>
<li>4 port USB hub (€5)</li>
</ul>
<p>That&#8217;s €115 in my case or € 210 if you don&#8217;t have any parts, which is a lot cheaper than a €800 notebook isn&#8217;t it?</p>
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		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>Samsung Galaxy S Wireless Inductive Charging Mod</title>
		<link>http://www.qianqin.de/2011/09/18/samsung-galaxy-s-wireless-inductive-charging-mod/</link>
		<comments>http://www.qianqin.de/2011/09/18/samsung-galaxy-s-wireless-inductive-charging-mod/#comments</comments>
		<pubDate>Sun, 18 Sep 2011 00:25:53 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[hardware]]></category>
		<category><![CDATA[with video]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=689</guid>
		<description><![CDATA[Well, after my Motorola Milestone 2 was sent in for repairs for 3 times in a row now and I decided to not use any Motorola devices anymore, so when Mediamarkt offered the Samsung Galaxy S Plus for €269, it was an instant buy. I mean, how can Motorola send me a defective unit back [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://www.qianqin.de/wp-content/uploads/2011/09/galaxysinductive.jpg"><img class="alignnone size-large wp-image-690" title="Samsung Galaxy S Plus on wireless inductive charging docking station" src="http://www.qianqin.de/wp-content/uploads/2011/09/galaxysinductive-530x298.jpg" alt="" width="530" height="298" /></a>Well, after my Motorola Milestone 2 was sent in for repairs for 3 times in a row now and I decided to not use any Motorola devices anymore, so when Mediamarkt offered the Samsung Galaxy S Plus for €269, it was an instant buy. I mean, how can Motorola send me a defective unit back from repair not only once, but twice? I haven&#8217;t received it back yet from their third try, but oh well, let&#8217;s hope somebody on eBay will be happy with it. Okay, no more Motorola, all Samsung now, the Galaxy S Plus works way better anyway. In fact, everything is perfect, except for one little thing. The USB connector of the Galaxy S Plus is on the top. How do you dock a phone in portrait mode with the USB connector on top? eBay suggested a rather ugly method with plugging a cable on top. So I remembered the Palm&#8217;s inductive charging feature and wanted it on my new phone. But all guides on the internet are either <a title="ugly induction hack" href="http://lifehacker.com/5598744/hack-an-induction-charger-to-work-with-any-cellphone">ugly</a> or <a href="http://www.instructables.com/id/Samsung-Epic-4g-Inductive-Charger/">voided the warranty</a>, but I wanted the best of both worlds, so my mod has to be invisible on first view and don&#8217;t void the warranty of my all new phone. (As the Galaxy S is build identically as the Galaxy S Plus, this mod should work flawlessly with the Galaxy S, too.)</p>
<p><span id="more-689"></span>So how did I do it? Well, the basics are the same, take a Palm Pre back cover (€10) + Touchstone dock (€20) and tear off the inductive circuit from the Pre back cover and insert it into the cover from the Samsung Galaxy S Plus. The tricky stuff is modifying to the micro USB plug. To be exact, to cut it really short so it doesn&#8217;t stand out. This requires some skill and a lot of patience. As the plug is really small, you definitely don&#8217;t want two wires coming from it. Two wires would require really small solder points which offer no stability at all and will just break after some days of use. So what you will have to do is to only wire the +5V only. Luckily, you can get 0V from everywhere inside, I used the micro SD card slot for it. The rest is pretty straight forward. Take a look at the video to see the finished mod:</p>
<p><iframe width="540" height="331" src="http://www.youtube.com/embed/740JaJ-UX0A?rel=0&amp;hd=1" frameborder="0" allowfullscreen></iframe></p>
<p><a href="http://www.qianqin.de/wp-content/uploads/2011/09/microusb.jpg"><img src="http://www.qianqin.de/wp-content/uploads/2011/09/microusb-150x150.jpg" alt="" title="Sawed off micro USB plug" width="150" height="150" class="alignright size-thumbnail wp-image-700" /></a>If you like to rebuild the mod, here are some more hints for you:</p>
<ul>
<li>Remove all pins from plug by pulling them out forcefully before sawing.</li>
<li>Buy more micro USB plugs to play with, as you will certainly break some before you finish one. I suggest using the inner (black) part of one plug combined with the metal casing of a different plug.</li>
<li>Bent one pin as shown on the picture so it can fit into 2 pin slots, then cut it to a length that it won&#8217;t shorten any pin.</li>
<li>Make the solder point as long as possible, this will add more stability.</li>
<li>If you happen to have black hot-glue, use it as a finish to cover up the complete slot.</li>
</ul>
<h4>UPDATE</h4>
<p>After I have shown this mod to my girlfriend, she wants it too on her Galaxy S. But she wants to keep her micro USB port free for cable connections for USB charging. Warranty is not much a problem for her, so she just wants a really pretty looking and invisible mod. If you like see a guide for that, drop me a comment here and I will document the process for you guys.</p>
<h4>UPDATE 2</h4>
<p>So as so many of you seem to want it, I&#8217;ll be filming the whole process of creating the high <a href="http://en.wikipedia.org/wiki/Wife_acceptance_factor">WAF</a> mod. For this, I will try to do this mod with no visible wires (why do girls hate them?), everything else as invisible as possible, backcover easily removable just as without the mod. I already ordered the parts and I am waiting for them to arrive. The camera is ready to roll.</p>
<h4>UPDATE 3</h4>
<p>Still waiting for parts to finish the high WAF mod, half of the mod is already completed and documented. I ordered them on Monday and they still haven&#8217;t arrived. Until then you can take a look at a <a href="http://blog.qinyujie.net/2011/09/24/557/">step to step guide for this version of the mod</a> done by <a href="http://www.qinyujie.net/">Yujie</a>.</p>
<h4>UPDATE 4</h4>
<p>Done! <a href="http://www.qianqin.de/2011/09/28/high-waf-inductive-charging-mod/">View the results here</a>.</p>
]]></content:encoded>
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		<slash:comments>48</slash:comments>
		</item>
		<item>
		<title>Jailbreaking, Rooting, tweaking your HP TouchPad</title>
		<link>http://www.qianqin.de/2011/08/24/jailbreaking-rooting-your-hp-touchpad-jailbreak-root-fur-das-hp-touchpad/</link>
		<comments>http://www.qianqin.de/2011/08/24/jailbreaking-rooting-your-hp-touchpad-jailbreak-root-fur-das-hp-touchpad/#comments</comments>
		<pubDate>Wed, 24 Aug 2011 21:07:54 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[software]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/2011/09/24/jailbreaking-rooting-your-hp-touchpad-jailbreak-root-fur-das-hp-touchpad/</guid>
		<description><![CDATA[The first thing I would do with a new iOS or Android device would be jailbreaking or rooting it, so how do I do it on my new HP TouchPad? After some searching, I found out that all you need is to switch to developer mode and that it is already built in. How great [...]]]></description>
			<content:encoded><![CDATA[<p>The first thing I would do with a new iOS or Android device would be jailbreaking or rooting it, so how do I do it on my new HP TouchPad? After some searching, I found out that all you need is to switch to developer mode and that it is already built in. How great is that?<span id="more-683"></span></p>
<p>To enable developer mode, all you need to do is to enter webos20090606 at your home screen where the just type it field is. This will let you start the Developer Mode Enabler and flip the switch. Done!</p>
<p>So what next? Jailbreaking an iOS device comes with Cydia, so what&#8217;s the counterpart for WebOS? Well, the name is <a title="Preware" href="http://preware.org">Preware</a>. Just follow this <a title="Preware Installation Guide" href="http://www.webos-internals.org/wiki/Application:Preware#Installing_Preware_with_WebOS_Quick_Install">step to step installation guide</a> for Preware via WebOS Quick Install. Now start up Preware on your TouchPad and install the following Patches:</p>
<ul>
<li>Muffle System Logging</li>
<li>Remove Dropped Packet Logging</li>
<li>Unset CFQ IO Scheduler</li>
<li>Unthrottle Download Manager</li>
<li>Quiet powerd Messages</li>
<li>Faster Card Animations HYPER Version</li>
<li>Increase Touch Sensitivity And Smoothness 10</li>
<li>Remove Tap Ripple</li>
<li>Ad Blocker</li>
<li>Advanced Reset Options</li>
</ul>
<div>Now your TouchPad should be incredibly fast. Enjoy!</div>
]]></content:encoded>
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		<slash:comments>7</slash:comments>
		</item>
		<item>
		<title>Goodbye and hello WebOS!</title>
		<link>http://www.qianqin.de/2011/08/23/goodbye-and-hello-webos/</link>
		<comments>http://www.qianqin.de/2011/08/23/goodbye-and-hello-webos/#comments</comments>
		<pubDate>Tue, 23 Aug 2011 13:02:30 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[computer]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/2011/08/23/goodbye-and-hello-webos/</guid>
		<description><![CDATA[The fire sale of the discontinued HP TouchPad has reached Germany. For € 99, a TouchPad could be yours, if you could manage to reach the online shop of HP. It was obviously down, as everyone wanted to get hold of this bargain. So I walked right into the next Mediamarkt and tried talking the [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://www.qianqin.de/2011/08/23/goodbye-and-hello-webos/hptouchpad/" rel="attachment wp-att-637"><img class="alignnone size-medium wp-image-637" title="HP TouchPad" src="http://www.qianqin.de/wp-content/uploads/2011/08/hptouchpad-259x300.jpg" alt="" width="259" height="300" /></a>The fire sale of the discontinued HP TouchPad has reached Germany. For € 99, a TouchPad could be yours, if you could manage to reach the online shop of HP. It was obviously down, as everyone wanted to get hold of this bargain. So I walked right into the next Mediamarkt and tried talking the salesman into selling me one for the discounted price. Of course he hasn&#8217;t heard anything about the sale, and I was unable to show him the new price because the HP online shop was down. So I had to make him let me talk to his superior and he then agreed to let me reserve one until they get the new price. So when I was walking out of the shop to get some food, I suddenly got a call, well, guess who called, the salesman who didn&#8217;t want me to sell the TouchPad. The price drop is here, time for me to pick my first and probably last WebOS device.<br />
<span id="more-635"></span><br />
So right now, I am writing from my new tablet. And I have to say, I am very surprised by WebOS. It feels like the first tablet that can actually multitask the way I want, or more the way I was used to in Windows. It is so easy to switch between apps. Not only that, the native Skype support blew me away. It was something that was missing on the iPad for years, but WebOS already comes with it and works so flawlessly.</p>
<p>My plan was to buy the TouchPad and put Android on it, but now, after trying WebOS, I want to keep it, as it really seems to be a nice OS for tablets. I have tried the iPad for quite a while but I could never find iOS very useful. It takes forever to switch between email, instant messaging and the browser. Android at least let me see all incoming events, but with webOS, the true multitasking fun is back. It&#8217;s actually fun to switch between the apps.</p>
<p>Maybe it was HP&#8217;s goal to let people try WebOS this way. I would have never bought a WebOS device if the price wouldn&#8217;t be this low. Now they should have quite some market share. People who bought the device will start making apps for it. This might be just the kick WebOS needed to start off. I wouldn&#8217;t pay more money for it, as tablets are pure couch browsers to me, but for this purpose, I find WebOS actually being the best choice for a tablet OS. I wonder if I will see any new WebOS devices around in the future.</p>
]]></content:encoded>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>I bought an Apple product!</title>
		<link>http://www.qianqin.de/2010/08/02/i-bought-an-apple-product/</link>
		<comments>http://www.qianqin.de/2010/08/02/i-bought-an-apple-product/#comments</comments>
		<pubDate>Mon, 02 Aug 2010 17:56:30 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[hardware]]></category>
		<category><![CDATA[interesting things]]></category>
		<category><![CDATA[with video]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=593</guid>
		<description><![CDATA[My friends know that I like to make fun of Apple fanboys, but now I&#8217;ve bought a Apple product myself. I was struggling really hard at &#8220;Media Markt&#8221;, oscillating between the cash desk and the shelves, but I did it! I bought an iPad from Apple. The iPad has everything, big screen, long battery life, [...]]]></description>
			<content:encoded><![CDATA[<p>My friends know that I like to make fun of Apple fanboys, but now I&#8217;ve bought a Apple product myself. I was struggling really hard at &#8220;Media Markt&#8221;, oscillating between the cash desk and the shelves, but I did it! I bought an iPad from Apple. The iPad has everything, big screen, long battery life, (too) easy to use interface, chinese hand-writing input, WiFi and simple games unlimited&#8230; It has everything my Mom needs! That and the unbeatable price of € 499 for an actually solid looking tablet, I have to admit there is no better and cheaper solution for my Mom to surf the internet and playing easy games without having to worry about viruses or where the next power outlet is.<br />
<span id="more-593"></span><br />
So if I&#8217;m already giving my Mom an iPad as a present, I wanted it to look even greater, so I decided to individualize it with an engraving. Apple doesn&#8217;t offer engraving for iPads yet, so I looked for companies who would offer such services and found a <a href="http://www.berlingravur.de/">company doing laser engraving called printjob24</a>, only 5 minutes away from Gravis at &#8220;Ernst-Reuter-Platz&#8221;. I called them, made sure they could engrave pictures and not only names and went there with the iPad. I choose a really old photo of my parents and me, converted it to a black and white picture and filmed the whole procedure. The result looks really great:</p>
<p><a href="http://www.qianqin.de/wp-content/uploads/2010/08/ipad.jpg"><img class="alignnone size-large wp-image-594" title="iPad" src="http://www.qianqin.de/wp-content/uploads/2010/08/ipad-530x392.jpg" alt="" width="530" height="392" /></a></p>
<p>The people at printjob24 are really nice, so I can really recommend them if anyone else needs an engraving. Here is the video:</p>
<p><object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="425" height="344" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="src" value="http://www.youtube.com/v/rj1eFxhzfPw&amp;hl=de&amp;fs=1" /><param name="allowfullscreen" value="true" /><embed type="application/x-shockwave-flash" width="425" height="344" src="http://www.youtube.com/v/rj1eFxhzfPw&amp;hl=de&amp;fs=1" allowscriptaccess="always" allowfullscreen="true"></embed></object></p>
]]></content:encoded>
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		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>The Perfect Home Server</title>
		<link>http://www.qianqin.de/2010/04/15/the-perfect-home-server/</link>
		<comments>http://www.qianqin.de/2010/04/15/the-perfect-home-server/#comments</comments>
		<pubDate>Thu, 15 Apr 2010 21:04:10 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[computer]]></category>
		<category><![CDATA[hardware]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=538</guid>
		<description><![CDATA[Perfect? Is that even possible? I guess not, but my newest server is pretty close in my opinion. The Focus was to get power consumption and price as low as possible while maintaining performance and safety. My current home server is an averages PC with an AMD64 and 2 GB of RAM while having a [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6400.jpg"><img class="alignnone size-thumbnail wp-image-541" title="Atom Server" src="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6400-150x150.jpg" alt="" width="150" height="150" /></a>Perfect? Is that even possible? I guess not, but my newest server is pretty close in my opinion. The Focus was to get power consumption and price as low as possible while maintaining performance and safety. My current home server is an averages PC with an AMD64 and 2 GB of RAM while having a RAID 5 with 6 hard disk. As you can imagine, my power bill is incredibly high, so I definitely want a more energy efficient solution this time.</p>
<p><span id="more-538"></span>First, I want to specify what the server has to be able to do IMHO:</p>
<ul>
<li>Mail Server with Exchange</li>
<li>VPN Server</li>
<li>File Server</li>
<li>DHCP Server</li>
<li>DNS</li>
<li>WDS</li>
<li>Print Server</li>
<li>Fail Safe to some degree</li>
<li>Silent</li>
<li>Low power consumption</li>
<li>Cheap</li>
</ul>
<p><a href="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6393.jpg"><img class="alignnone size-thumbnail wp-image-540" title="RAID 1" src="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6393-150x150.jpg" alt="" width="150" height="150" /></a>So the first 7 can all be solved by running a Windows Server 2008 R2 with Exchange 2010 (luckily both are free for MSDNAA), so no problem here. The next point, fail safe is a little trickier. First, a RAID system is needed because the last thing I want is that I lose all my data because my hard disk died (which happens pretty often). To get a lower power consumption, the only possible solution would be running a RAID 1 (Mirror) with two hard drives. To keep it cheap and get the power usage down, only &#8220;green&#8221; hard disk should be used. I choose the Western Digital Caviar Green 1500GB (WD15EARS) drives with Advanced Format as they are really cheap and offer better performance and hopefully better security due to better CRC calculation with longer CRC data. Next was the main-board and CPU. Well, to run Windows Server 2008 R2, I would need a x64 capable CPU with at least 2 cores. And guess what, there is only one solution for this, the Gigabyte GA-D510UD. It&#8217;s the only board that supports RAID onboard while have 2 cores (+ Hyper-threading) and is really power efficient.</p>
<p><a href="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6389.jpg"><img class="alignnone size-thumbnail wp-image-539" title="Atom Opened" src="http://www.qianqin.de/wp-content/uploads/2010/04/IMG_6389-150x150.jpg" alt="" width="150" height="150" /></a>Gigabyte not only offers the board with CPU, but also the smallest Mini-ITX case &#8220;Gigabyte MIB T5140&#8243; with 2 native 3.5&#8243; drive slots, perfect for my RAID 1. The only thing that didn&#8217;t match my criteria was the 40mm CPU fan of the Gigabyte board. Why on earth didn&#8217;t they make the system passive like the competition? Well, what is the first thing you do if you have a noisy fan? Right, you remove it and replace it with something bigger and silent. I took a old 120 mm Arctic Cooling fan out of my old server and mounted it right above the CPU and guess what? It fits perfectly, like it was designed to be used this  way.</p>
<p>Now after inserting 2x2GB of RAM, I&#8217;m ready to get incredibly silent and cheap server filled up with data. And just in case anyone whats to recreate the server, here is the list of things you&#8217;ll need:</p>
<ul>
<li>Gigabyte GA-D510UD (€ 70)</li>
<li>Gigabyte MIB T5140 (€ 50)</li>
<li>G.Skill DIMM Kit 4GB PC2-6400U CL5-5-5-15 (€ 80) or similiar 2x 2GB DDR2 RAM</li>
<li>2x Western Digital Caviar Green 1500GB (WD15EARS) (2x € 80) or similiar SATA hard disk</li>
<li>Arctic Cooling 12025 L (€ 5) or similiar 120 mm fan</li>
</ul>
<p>Total of € 365 in April 2010.</p>
<div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow: hidden;">
<h1 class="arthdr"><span class="notrans">WD15EARS</span></h1>
</div>
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		<title>Notebook and other small devices&#8217; power supply efficiency</title>
		<link>http://www.qianqin.de/2010/04/15/notebook-and-other-small-devices-power-supply-efficiency/</link>
		<comments>http://www.qianqin.de/2010/04/15/notebook-and-other-small-devices-power-supply-efficiency/#comments</comments>
		<pubDate>Thu, 15 Apr 2010 13:53:52 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[hardware]]></category>
		<category><![CDATA[interesting things]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=529</guid>
		<description><![CDATA[Green IT is a big topic, that&#8217;s why more and more computer power supplies get a 80 PLUS label for showing off their superior efficiency. But if you every decide to run a Intel Atom based PC, use a PicoPSU, just power your notebook or charge your phone, you won&#8217;t really find out how efficient the power [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://www.qianqin.de/wp-content/uploads/2010/04/2010-04-15_14-05-06_879_Berlin1.jpg"><img class="alignnone size-thumbnail wp-image-531" title="Toshiba R400 Notebook Power Supply" src="http://www.qianqin.de/wp-content/uploads/2010/04/2010-04-15_14-05-06_879_Berlin1-150x150.jpg" alt="" width="150" height="150" /></a>Green IT is a big topic, that&#8217;s why more and more computer power supplies get a 80 PLUS label for showing off their superior efficiency. But if you every decide to run a Intel Atom based PC, use a PicoPSU, just power your notebook or charge your phone, you won&#8217;t really find out how efficient the power supply is. I came across this problem while searching for an efficient power supply for my new Atom-based home server. First, I wanted to use an 80 PLUS 350W power supply, but after reading some reviews, I found out that they are totally inefficient (&lt;50%) on low load (&lt;50W), which the targeted power consumption of my new home server is supposed to be. So I googled and found the PicoPSU, advertising &gt;93% efficiency. Wow great, but wait, it needs to be powered by 12V DC. How efficient is the converter from 110/220V AC to 12V DC? No word on the manufacture site. I tried to google for efficient converter, but had no luck, so I gave up&#8230; until the case of my new home server arrived, a Gigabyte MIB T5140.<span id="more-529"></span></p>
<p><a href="http://www.qianqin.de/wp-content/uploads/2010/04/2010-04-15_14-04-16_418_Berlin1.jpg"><img class="alignnone size-thumbnail wp-image-530" title="Efficiency Level V" src="http://www.qianqin.de/wp-content/uploads/2010/04/2010-04-15_14-04-16_418_Berlin1-150x150.jpg" alt="" width="150" height="150" /></a>The Gigabyte MIB T5140 comes with a passive power supply which converts from 110/220V AC to 12V DC and has a labeled efficiency level of &#8220;V&#8221;. What the hell is that supposed to mean? Is that good or bad? I started to look at my other passive power supplies and found another label on the Toshiba R400&#8242;s. This time, it says &#8220;IV&#8221;. I guess they are meant to represent numbers, 4 and 5. But is higher better? I started searching again until I found the be-quiet notebook power, which has a &#8220;CEC&#8221; efficiency of &#8220;V&#8221;. That was the missing clue. CEC stands for Canadian Energy Commision  (Energy Star) and would be perfect for certifying power supply efficiencies. But how efficient is level &#8220;V&#8221;? I started going through <a href="http://www.energystar.gov/ia/partners/prod_development/downloads/efficiency_challenge.pdf">white papers</a> of CEC and they only mentioned what I-IV mean, showing that V is reserved for future use. How can I have a level V power supply then?</p>
<p>I started to dig deeper and finally found a paper about <a href="http://www.energystar.gov/ia/partners/prod_development/revisions/downloads/International_Efficiency_Marking_Protocol.pdf">International Efficiency Marketing  Protocol</a>, which finally revealed what efficiency a power supply has to have at what level including level V. And  here are the results. I created a little table to show you how the the levels correspond to the actual efficiency.</p>
<table>
<tbody>
<tr>
<td>Level</td>
<td>Max. Output</td>
<td>Min. average efficiency</td>
</tr>
<tr>
<td>I</td>
<td>-</td>
<td>lower than all other classes</td>
</tr>
<tr>
<td>II</td>
<td>1W</td>
<td>39%</td>
</tr>
<tr>
<td>II</td>
<td>10W</td>
<td>64%</td>
</tr>
<tr>
<td>II</td>
<td>30W</td>
<td>75%</td>
</tr>
<tr>
<td>II</td>
<td>&gt;50W</td>
<td>82%</td>
</tr>
<tr>
<td>III</td>
<td>1W</td>
<td>49%</td>
</tr>
<tr>
<td>III</td>
<td>10W</td>
<td>70%</td>
</tr>
<tr>
<td>III</td>
<td>30W</td>
<td>80%</td>
</tr>
<tr>
<td>III</td>
<td>&gt;50W</td>
<td>84%</td>
</tr>
<tr>
<td>IV</td>
<td>1W</td>
<td>50%</td>
</tr>
<tr>
<td>IV</td>
<td>10W</td>
<td>71%</td>
</tr>
<tr>
<td>IV</td>
<td>30W</td>
<td>81%</td>
</tr>
<tr>
<td>IV</td>
<td>&gt;50W</td>
<td>85%</td>
</tr>
<tr>
<td>V</td>
<td>1W (&gt;6V)</td>
<td>77%</td>
</tr>
<tr>
<td>V</td>
<td>10W (&gt;6V)</td>
<td>74%</td>
</tr>
<tr>
<td>V</td>
<td>30W (&gt;6V)</td>
<td>83%</td>
</tr>
<tr>
<td>V</td>
<td>&gt;50W (&gt;6V)</td>
<td>87%</td>
</tr>
</tbody>
</table>
<p>So when you look at those values, you can see that III and IV are pretty much the same, only level V shows real improvement. At the same time, when you think that you are using a PicoPSU with 96% efficiency, you would actually only get 87%*96%=83% total efficiency, which isn&#8217;t so great at all.</p>
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		<title>MultiSim, my first Android Application</title>
		<link>http://www.qianqin.de/2010/02/24/multisim-my-first-android-application/</link>
		<comments>http://www.qianqin.de/2010/02/24/multisim-my-first-android-application/#comments</comments>
		<pubDate>Wed, 24 Feb 2010 19:10:31 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[software]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=503</guid>
		<description><![CDATA[I just got my new Android cell phone, the Motorola Milestone/Droid and I have to say Android is great! It&#8217;s so much better than Windows Mobile. A lot of the functionality comes from the Android Market. So while I was downloading Apps from it, I couldn&#8217;t find any tools for managing my analog dual-sim-adapter, so [...]]]></description>
			<content:encoded><![CDATA[<p><img class="alignnone size-full wp-image-502" title="MultiSim Logo" src="http://www.qianqin.de/wp-content/uploads/2010/02/icon.png" alt="" width="72" height="72" />I just got my new Android cell phone, the Motorola Milestone/Droid and I   have to say Android is great! It&#8217;s so much better than Windows Mobile.  A  lot of the functionality comes from the Android Market. So while I  was  downloading Apps from it, I couldn&#8217;t find any tools for managing my   analog dual-sim-adapter, so I decided to write one on my own. The <a href="http://developer.android.com/sdk/index.html">Android SDK</a> seemed to be very well documented, so I thought I give it a try. And   guess what, I found the resulting program to be useful enough that I   purchased a Market-Account for $25 and published it there. Find out more   on the <a href="/multisim/">MultiSim section</a> of my website.</p>
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		</item>
		<item>
		<title>Back online!</title>
		<link>http://www.qianqin.de/2009/10/05/back-online/</link>
		<comments>http://www.qianqin.de/2009/10/05/back-online/#comments</comments>
		<pubDate>Mon, 05 Oct 2009 19:29:31 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[hardware]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=467</guid>
		<description><![CDATA[A few weeks ago, my T-Home Entertain VDSL 50 stopped working, for no reason at all. My VDSL modem, the &#8220;Speedport 300HS&#8221; suddenly couldn&#8217;t sync anymore. I thought T-Com is probably doing maintenance, so I waited for a day, but it still wouldn&#8217;t sync. So I called the T-Com, asking what the problem would is. [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://www.qianqin.de/wp-content/uploads/2009/10/thomewtf-300x148.jpg" alt="T-Home WTF?!" title="T-Home WTF?!" width="300" height="148" class="alignnone size-medium wp-image-469" />A few weeks ago, my T-Home Entertain VDSL 50 stopped working, for no reason at all. My VDSL modem, the &#8220;Speedport 300HS&#8221; suddenly couldn&#8217;t sync anymore. I thought T-Com is probably doing maintenance, so I waited for a day, but it still wouldn&#8217;t sync. So I called the T-Com, asking what the problem would is. They told me everything should be fine, but I can order a technician, who can come to my place to check the line. The only condition is, if my line isn&#8217;t broken, I&#8217;d have to pay €100 for the technician.<br />
<span id="more-467"></span><br />
Well, what choice do I have, I told the lady on the phone to immediately sent a technician, but unluckily, I called on a Saturday, so she told me I have to wait until Monday, when they&#8217;ll call me back. Well, I waited the whole Monday, but no call. So much for &#8220;Siftung Warentest&#8217;s&#8221; best score for T-Com service. Anyway, they did call on Tuesday, but it was only an appointment maker, not the technician himself. The technician was busy that day, so the earliest time he could come would be Thursday.</p>
<p>So I waited until Thursday, the appointment was between 12:00 and 18:00 and the technician did show up at 17:20. The only problem was that he had broke his diagnosis tool, making it impossible to fix my line. How great is that? Anyway, he promised to come back on Friday morning at 10:00, hopefully with a new diagnosis tool. Well, I waited until Friday 10:00 and guess what, no technician. 20 minutes later, the technician called and told me he would come a little later because he&#8217;s busy with another costumer. So I waited and waited and at 12:00, he finally came. Well, after running around testing things for an hour, he finally managed to get a sync with his diagnosis tool, but still couldn&#8217;t get my modem to sync with the line. He simply told me that the modem is broken and I should get a new one as he doesn&#8217;t have any replacement hardware. How I do that is my problem, but he won&#8217;t charge the €100 because the line was broken too. So I still don&#8217;t know why my line is broken and now, when it is finally fixed, I don&#8217;t have any hardware to go online. WTF! </p>
<p>Unluckily, my VDSL modem is more than 2 years old, so it&#8217;s already out of the warranty, so I decided to call T-Com to ask for new hardware. They have a special hot-line for ordering hardware, but it costs 14 cent/min! What kind of rip of is that? I called the normal support hot-line (which is free) and let them transfer me the the hardware hot-line. A quite unfriendly and nerved service lady picked up the phone and after I told her the story, she told that I can either buy a new modem for €80 or a new router with integrated modem (W920V) for €199. OMG, I&#8217;m paying €70 every month for my VDSL line and after a whole week offline, I should still pay a whole fortune to get new hardware? Any other ISP would have given out the hardware for their long term customer for free (I know that from 1and1 as my girlfriend is using it and she just got new hardware). I told her that 1and1 is offering the same VDSL now for €20 less each month, free hardware and €200 bonus if I switched, but I&#8217;d stay with T-Com if they give me some hardware to go online with. Guess what she answered: &#8220;Sorry, I can&#8217;t do that, I guess you&#8217;ll just have to switch&#8221; I seriously didn&#8217;t know what to answer to that. I mean, doesn&#8217;t the T-Com want to keep me as their customer? I&#8217;m one of the few people using their most expensive packages right from the beginning. Is this the way <a href="http://en.wikipedia.org/wiki/Early_adopter">early adopters</a> are treated now? I recommended a lot of people for VDSL at T-Com, but that is over now!</p>
<p>As my contract is still going for a few month, I went on eBay and bought myself a new W920V for €100, thats half the price than what T-Com wants from their paying costumers! </p>
]]></content:encoded>
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		</item>
		<item>
		<title>Things about Li-Ion batteries</title>
		<link>http://www.qianqin.de/2009/07/12/things-about-li-ion-batteries/</link>
		<comments>http://www.qianqin.de/2009/07/12/things-about-li-ion-batteries/#comments</comments>
		<pubDate>Sun, 12 Jul 2009 21:58:17 +0000</pubDate>
		<dc:creator>Qian Qin</dc:creator>
				<category><![CDATA[computer]]></category>
		<category><![CDATA[hardware]]></category>
		<category><![CDATA[interesting things]]></category>

		<guid isPermaLink="false">http://www.qianqin.de/?p=446</guid>
		<description><![CDATA[Li-Ion batteries are practically everywhere. They are used for mobile phones, notebooks, even cars. But most people don&#8217;t really know about them and give out wrong hints on how to use and charge them. So here are two important facts about Li-Ion batteries you should know: The less the a Li-Ion battery cell is discharged, [...]]]></description>
			<content:encoded><![CDATA[<p>Li-Ion batteries are practically everywhere. They are used for mobile phones, notebooks, even cars. But most people don&#8217;t really know about them and give out wrong hints on how to use and charge them. So here are two important facts about Li-Ion batteries you should know:<br />
<span id="more-446"></span></p>
<ol>
<li>The less the a Li-Ion battery cell is discharged, the more often you can charge it. Discharging 5% will allow you to charge it hundreds of thousands of times, while completely depleting it will drop the charging cycles to below <strong>10</strong> times. Luckily, most batteries will turn themselves off once discharged to 40%. Here is the thing about cheaper batteries promising to have more capacity than original batteries. Li-Ion cell&#8217;s power capacity is limited, so to increase the usable capacity, the manufacturer can either increase the battery size or allow deeper discharges. The second choice is a cheap way to buy &#8220;more&#8221; capacity by lowering charging cycles.</li>
<li>A Li-Ion battery will go bad on its own. The only question is how fast. When a Li-Ion battery is fully charged, it&#8217;ll lose about 20% a year of its capacity when stored at 25°C, or 35% when stored at 40°C. Placing a fully charged cell in the fridge at 0°C will slow down aging to about 6%. A only 50% charged cell will only age for 2% a year at 0°C or 4% at 25°C. This is the reason why notebook batteries are always half-charged when shipped. Lower temperatures will slow down aging, but never cool them below -25°C, which will break the battery.</li>
</ol>
<p>So the big question is how should one use their battery to get the most out of it. A lot of friends ask me this question, as most known battery hints are either for Ni-Cd or Ni-MH batteries and not for Li-Ion batteries. I usually tell them to charge when it is convenient and use when needed. The thing with Li-Ion is that charging cycles will drop when discharged deeply. But if you keep your batteries always full, they&#8217;ll age a lot faster. So when the best trade-off is to charge them fully and use them right afterwards and recharge when you know you&#8217;ll be using it again soon.</p>
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