Formatting External USB Drives
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From: Jerry Peters on 10 Apr 2010 16:51 David W. Hodgins <dwhodgins(a)nomail.afraid.org> wrote: > On Fri, 09 Apr 2010 22:50:04 -0400, Grant Edwards <invalid(a)invalid.invalid> wrote: > >> Can somebody explain why IDE DMA timing would affect a USB attached >> drive? > > As I understand it, even though the usb-storage module is being used > to provide the raw access, the ide modules are used to actually do > the data transfer. I may be wrong in this, which is why I'd like > to know if either of the workarounds I suggested actually work. > > Both of those workarounds were from when the ata module(s) were > detecting 80 wire ide cables when 40 wire ide cables were actually > installed. In that case, the kernel module selected udma transfer > rates, that the cables could not handle. > > This may have no impact in this case, but I can't think of any other > reason why the use of usb to access the drive would fail, while the > same drive works fine when internally connected, other then a problem > with the enclosure. > > Note that usb uses dma access too. > > Regards, Dave Hodgins > No, AFAIK USB storage uses the *SCSI* drivers, in this case sd. One possibility is that the IDE/USB bridge is having problems. How big is the disk? Perhaps the bridge doesn't support the larger LBA modes. Jerry
From: Kevin the Drummer on 10 Apr 2010 17:19 Jerry Peters <jerry(a)example.invalid> wrote: > No, AFAIK USB storage uses the *SCSI* drivers, in this case sd. > > One possibility is that the IDE/USB bridge is having problems. How big > is the disk? Perhaps the bridge doesn't support the larger LBA modes. The disk is 1TB and the enclosure is rated for up to 2GB. I've got the disk installed internally now on the SATA bus. It's working just fine. I have 3 partitions of 15GB and one partition of around 880GB. Does that tell you anything? Thanks... -- PLEASE post a SUMMARY of the answer(s) to your question(s)! Unless otherwise noted, the statements herein reflect my personal opinions and not those of any organization with which I may be affiliated.
From: Grant Edwards on 10 Apr 2010 23:45 On 2010-04-10, Kevin the Drummer <nobody(a)cosgroves.us> wrote: > Grant Edwards <invalid(a)invalid.invalid> wrote: > >> > This may have no impact in this case, but I can't think of any other >> > reason why the use of usb to access the drive would fail, while the >> > same drive works fine when internally connected, other then a problem >> > with the enclosure. >> >> I think you've hit the nail on the head: the USB<->IDE chip in the >> enclosure is buggy. > > Is there a USB<->IDE chip in my enclosure if it supports SATA > drives and not ATA (IDE) drives? No, then it's a USB<->SATA chip, and it's probably buggy. -- Grant
From: Jerry Peters on 11 Apr 2010 16:18 Kevin the Drummer <nobody(a)cosgroves.us> wrote: > Jerry Peters <jerry(a)example.invalid> wrote: > >> No, AFAIK USB storage uses the *SCSI* drivers, in this case sd. >> >> One possibility is that the IDE/USB bridge is having problems. How big >> is the disk? Perhaps the bridge doesn't support the larger LBA modes. > > The disk is 1TB and the enclosure is rated for up to 2GB. > > I've got the disk installed internally now on the SATA bus. It's > working just fine. I have 3 partitions of 15GB and one partition > of around 880GB. Does that tell you anything? > > Thanks... > I'm assuming you meant 2TB. Should be fine from the adressing standpoint. I'd still guess bad SATA to USB bridge chip, or poorly designed enclosure (marginal power supply, poor pcb layout, etc). A lot of these enclosures are just plain junk. Jerry
From: Kevin the Drummer on 12 Apr 2010 13:10
Jerry Peters <jerry(a)example.invalid> wrote: > I'm assuming you meant 2TB. Yes. It'll take me a while to type a T instead of a G, like when it took a while to get over the M or change the year when I write checks (what are those?). > Should be fine from the adressing standpoint. I'd still guess > bad SATA to USB bridge chip, or poorly designed enclosure > (marginal power supply, poor pcb layout, etc). A lot of these > enclosures are just plain junk. I'm thinking I've either got bad gear, or incompatible gear. The enclosures have an RMA and I'll be sending them back, trying NexStar next. Thanks.... -- PLEASE post a SUMMARY of the answer(s) to your question(s)! Unless otherwise noted, the statements herein reflect my personal opinions and not those of any organization with which I may be affiliated. |