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http://redwolf.ws/wiki/index.php?title=Why_USB_sucks&feed=atom&action=history 2024-04-16T04:23:23Z Revision history for this page on the wiki MediaWiki 1.27.0
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http://redwolf.ws/wiki/index.php?title=Why_USB_sucks&diff=394&oldid=prev 2010-05-11T09:27:43Z

<p>New page: Here&#039;s my common diatribe against USB. The main thing is USB&#039;s speed. Yeah, USB 2.0 High Speed is 480 Mbit/s. That&#039;s 60 Mbyte/s, right? &#039;&#039;&#039;No. It is 24 Mbyte/s.&#039;&#039;&#039; * First of all, US...</p> <p><b>New page</b></p><div>Here&#039;s my common diatribe against USB. <br /> <br /> The main thing is USB&#039;s speed. Yeah, USB 2.0 High Speed is 480 Mbit/s. That&#039;s 60 Mbyte/s, right?<br /> <br /> &#039;&#039;&#039;No. It is 24 Mbyte/s.&#039;&#039;&#039;<br /> <br /> * First of all, USB&#039;s spec says that each byte is sent with start and stop bits. That means for every 8-bit byte, it takes 10 bits. So that 480 Mbit/s turns into 48 Mbyte/s.<br /> * Second, USB&#039;s spec says it&#039;s not only synchronous, but also each device cannot &quot;interrupt&quot; the bus. The PC must probe each device on a regular basis and handle the transfer. No PC chipset has off-loaded the handling of USB from the CPU. That halves the speed and drags down the CPU to boot, making it 24 Mbyte/s.<br /> <br /> Firewire doesn&#039;t have that latter set of limitations and hits a solid 40 Mbyte/s.</div>

STrRedWolf