On Jan 3, 2008 5:27 PM, Gus Wirth <[EMAIL PROTECTED]> wrote:
>
> Carl Lowenstein wrote:
> > On Jan 3, 2008 12:20 AM, Carl Lowenstein <[EMAIL PROTECTED]> wrote:
> >> On Jan 2, 2008 11:47 PM, James G. Sack (jim) <[EMAIL PROTECTED]> wrote:
> >>> Carl Lowenstein wrote:
> >>>> I just got a new USB disk drive and have encountered some interesting
> >>>> problems trying to use it.
> >>> What model drive is it?
> >>> Not a Seagate FreeAgent, is it?
> >>>
> >>> Justaguess:
> >>> # rmmod usb_storage && modprobe usb_storage
> >> Maxtor 500GB SATA (today's Fry's special) in an Acomdata box (another
> >> Fry's special).
> >> This is the second of these Acomdata boxes I have purchased recently,
> >> and the first one is working well. (although I have not tried it with
> >> either of the laptops)
> >
> > More experimental evidence. Working with the Presario (64-bit dual
> > Turion, Ubuntu 7.10).
> >
> > As I noted before, if I connect the USB hard drive to the computer and
> > then boot the OS, the drive is recognized and mounted at
> > /media/<volume_label>. It is /dev/sdb
> >
> > If I unmount the drive with the GUI, the mount point
> > /media/<volume_label> goes away but /dev/sdb is still there. I can
> > mount and umount it by command line, at my own choice of mount point.
> > If I then pull the cable, /dev/sdb goes away. But I can't just plug
> > the cable in again and get it back.
> >
> > Today's experiments, with much confusion involved. Boot the OS. Then
> > connect the USB hard drive. Get much complaint logged by dmesg.
> > Including the interesting one:
> > irq7: nobody cares. Try booting with "irq_poll" option.
> > Tried it, nothing better happened.
> >
> > Boot computer again, connect the USB hard drive. Do "lsmod" to see
> > modules. Then connect a USB memory stick. Presto, voila', _both_
> > drives are recognized and mounted. They are /dev/sdb and /dev/sdc,
> > and are mounted at /media/<volume_label> and /media/disk respectively.
> > Something happens when the memory stick is mounted that stimulates
> > mounting of the hard drive.
> >
> > Presumably if I unmount the memory stick, the hard drive will still be
> > there.
> >
> > $ cat /proc/scsi/scsi gives the appropriate drive identification data.
> >
> >
> You may be experiencing a udev problem. Try looking in
> /etc/udev/rules.d/ and see if there are any files that have been set up
> for persistent storage. Sometimes the generated rules are too strict and
> will refuse to detect a device because it doesn't match some seemingly
> arbitrary criteria.
>
> The whole autodetect thing is governed by udev and hald, and although I
> know generally how it's supposed to work I haven't slogged through the
> details yet. It has some very annoying behaviors.
>
I think I found a clue, after a bunch of Google fumbling. This is
Ubuntu 7.10 Gutsy.
/etc/init.d/mountdevsubfs.sh, lines 39-45 are titled "Magic to make
/proc/bus/usb work"
Lines 42-45 that actually would do something are commented out. This
is apparently a change from previous Ubuntu releases.
I found this in a discussion of making Ubuntu work under VMWare, which
is not a place where one would normally be looking.
I will have to try this, as soon as the full badblocks(8) surface
check finishes, about 24 hours from now.
--
carl lowenstein marine physical lab u.c. san diego
[EMAIL PROTECTED]
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