[PLUG] USB Mass Storage errors

[Matt Alexander]

On Mon, 13 Sep 2004, Russell Senior wrote:

>
> I've got a 200 Gig IDE drive in an external enclosure, used as a
> backup device.  I am getting occasional lockups during particularly
> intense rsyncs, and just had my first on 2.6.8.1 last night.
> Afterwards, I began getting messages like:
>
>    scsi4: ERROR on channel 0, id 0, lun 0, CDB: Read (10) 00 00 00 6a 8a 00 00 04 00
>    Current sdb: sense key Medium Error
>    Additional sense: Unrecovered read error
>    end_request: I/O error on device sdb1, logical block 27273
>
> and on and on for different blocks.  I vaguely recall hearing about
> IDE devices that could screw up the checksums on sectors if shut down
> abruptly, and subsequently assign read errors to them as a result.  Is
> that a likely scenario here, and if so is there anything I can do
> about it, like a reformat.  The smartutils stuff doesn't (or didn't
> when I tried a while ago) seem to work across the USB-to-IDE bridge,
> but I'd be willing to jack the thing directly into an IDE port if I
> can fix it.
>
> The disk is, from what I can tell from the logs:
>
>   scsi4 : SCSI emulation for USB Mass Storage devices
>     Vendor: Maxtor 6  Model: Y200P0            Rev:  0 0
>     Type:   Direct-Access                      ANSI SCSI revision: 02
>   SCSI device sdb: 398297088 512-byte hdwr sectors (203928 MB)
>    sdb: sdb1

I don't have a solution, but I experienced the same thing with a
USB-to-IDE bridge used for backups.  I ended up taking it back and
assumed it was the USB-to-IDE bridge that was at fault.  Then I just
attached an internal drive and haven't tried to do the USB connection
since.
~M