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.
Side question, generated while looking at lsmod output. It comes in 3
columns, headed:
Module Size Used By
I understand Module and Size. But the first entry in the Used By
column is a small integer. It looks like it might be a count of the
number of entries in "Used By" and sometimes it is. But not always.
Groveling through the man.page and source for lsmod I find that it is
merely reformatting the contents of /proc/modules. But that doesn't
help.
carl
--
carl lowenstein marine physical lab u.c. san diego
[EMAIL PROTECTED]
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