Re: USB and scsi problem

From: Robert Heller (heller_at_deepsoft.com)
Date: 04/07/05 

Date: Thu, 07 Apr 2005 00:40:18 +0200

  John F <john@PleaseSeeSigForAddress.invalid.com>,
  In a message on Wed, 6 Apr 2005 15:24:06 +0000 (UTC), wrote :

JF> I'm running Slackware 9.0, and can successfully read files
JF> off a Fuji finepix camera and read/write to a usb external disk.
JF> They each appear as /dev/sda1 (or /dev/sda1...n for the disk)
JF> when plugged in separately (and I haven't yet tried mounting
JF> them simultaneously).

The first one plugged in will be /dev/sda1...n and the second one
plugged in will be /dev/sdb1...n -- see below.

JF> The problem occurs when I plug in an actual pci scsi card
JF> (with or without an attached disk) and modprobe the driver for it.
JF> Then I'd expect the usb device to appear as /dev/sdb1...n,
JF> but it just doesn't show up at all.

Are you sure? Can you dump out what shows up in /var/log/messages when
you attach the camera (jack in the USB cable, both with and without the
SCSI card and/or SCSI disk? It won't show up as /dev/sdb1...n, unless
you have an actual SCSI drive. If the pci SCSI card *does not* have a
disk attached to it (including a zip or orb drive), than the camera
will still show up as /dev/sda1...n. If you have two disks on the SCSI
controller, the camera will still show up as /dev/sdc1...n. Note: if
you have a SATA disk and you are using the SATA controller (eg
ata_piix), it too will show up as a SCSI disk. SCSI device names (/dev/sda,
/dev/sdb, ...) are awarded on a first come, first served basis.

JF> From the USB-Digital-Camera-HOWTO, I expected it to show
JF> up as /dev/sdb, though the author also says he assumes you
JF> don't have an actual scsi card. Googling linux usb scsi gives
JF> me 800,000 hits, and I'm sure the answer's there somewhere, but
JF> couldn't narrow down the search enough to find it.
JF> Thanks for any help or pointers,
JF> --
JF> John Forkosh ( mailto: j@f.com where j=john and f=forkosh )
JF>

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