Date: Sun, 23 Feb 2003 17:24:54 -0500 From: "Lawrence Young" <[EMAIL PROTECTED]> Subject: Re: [LIB] USB Card
L100/110's IDE channel is Enhanced IDE only. Only a little better than L50/70's regular ATA. However, L100/100's CardBus slots is connected to its internal PCI bus which is capable of 132 MBytes/sec. But, the Toshiba PCMCIA/CardBus controller used in L100/110 does not support DMA. Hence the limiting factor on how fast a USB 2.0 card can move is the processor speed. ----- Original Message ----- From: "Matthew Hanson" <[EMAIL PROTECTED]> To: "Libretto" <[EMAIL PROTECTED]> Sent: Saturday, February 22, 2003 1:32 AM Subject: Re: [LIB] USB Card 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 _________________________________________________________________ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest ************************************************************** ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
