Date: Sat, 22 Feb 2003 06:28:27 +0000 From: "Matthew Hanson" <[EMAIL PROTECTED]> Subject: Re: [LIB] USB Card
From: Paul Bristow <[EMAIL PROTECTED]>
I have a USB2 card working on my L100 under Linux. You definately do not need to use the DC adapter for low-power USB 1.1 devices. I have no idea what speed I get as I do not actually own any USB2 peripherals.
A while back I did a bit of research on various kinds of transfer rates, and came up with this list of theoretical rates depending on a systems components:
* Ultra DMA ATA/33 hard disk drive 264Mbps (33MB/s) * Ultra DMA ATA/66 hard disk drive 528Mbps (66MB/s) * Ultra DMA ATA/100 hard disk drive 800Mbps (100MB/s) * USB 1.1, supporting 127 devices up to 12 Mbps (1.5MB/s) * USB 2.0, supporting 127 devices up to 480Mbps (60MB/s) * Firewire IEEE-1394, supporting 63 devices up to 400Mbps (50MB/s)
So if anyone knows the limitations of bus speeds for the different Libs, maybe we can determine if, say a Lib o/c to 266MHz would be able to perform transfers faster with a USB 2.0 interface over USB 1.1.
I would guess the Libs use ATA/33 HDDs, but Ultra DMA? I don’t know enough about HDD specs.
Matt
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