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Re: FW: Thumbdrive



Jared L. Black wrote:
On Sat, 2003-11-01 at 14:34, Bob McClure Jr wrote:

On Sat, Nov 01, 2003 at 11:30:56AM -0800, Jared L. Black wrote:

-----Original Message-----
From: Bob McClure Jr [mailto:robertmcclure earthlink net] Sent: Thursday, October 30, 2003 7:26 AM
To: Jared L. Black
Subject: Re: Thumbdrive


On Wed, Oct 29, 2003 at 09:09:43PM -0800, Jared L. Black wrote:

I got your response regarding my question about mounting a thumbdrive.

Thanks very much.

I still have a question. While I can mount the thumbdrive as root, I have to do the mount as root after each boot (I guess) because the

fstab


file doesn't have the /dev/sda1 line in it. Should I just edit the fstab file by adding the following?

/dev/sda1 /mnt/thumbdrive auto

noauto, user,kuduz, rw 0 0

No, for two reasons.


1. The existence of the kudzu (not kuduz) option indicates that kudzu
  (the device detector) made the entry and will remove it when you
  remove the thumbdrive.

2. You could add the entry without "kudzu" and kudzu will leave it
  alone, but the device assignment is done dynamically, and if you
  plug in other devices, the thumbdrive may get another assignment.

BTW, the line above doesn't make any sense because it has both the
auto and noauto options which are in conflict.  "man mount" for more
information.

If that is the only thing you plug in, you could put this line into
/etc/fstab:

/dev/sda1 /mnt/thumbdrive auto,user rw 0 0

Change "auto" to "noauto" if you don't want the thumbdrive mounted at
boot time.



Thanks in advance,
Jared Black

Cheers, -- Bob McClure, Jr. Bobcat Open Systems, Inc. robertmcclure earthlink net http://www.bobcatos.com What if God is asking _us_ for a sign?


Some strange things happen when I edit the fstab file. I insert the line as suggested above, but the next time I boot, the mount /mnt/thumbdrive doesn't work (except for root as it always has). When I do a "cat /etc/fstab" the added line for the thumbdrive is missing; something deletes it. The original fstab listing is below (with some spaces removed to avoid wrapping) and it returns to this form after inserting the line for the thumbdrive and rebooting.

Is there a utility for adding the thumbdrive so that all the modules
that might be offended by manual editing of the fstab file are
satisfied?

LABEL=/             /                ext3    defaults        1 1
LABEL=/boot         /boot            ext3    defaults        1 2
none                /dev/pts         devpts  gid=5,mode=620  0 0
none                /proc            proc    defaults        0 0
none                /dev/shm         tmpfs   defaults        0 0
/dev/hda6           swap             swap    defaults        0 0
/dev/fd0            /mnt/floppy      auto    noauto,owner,kudzu 0 0
/dev/cdrom          /mnt/cdrom       iso9660 noauto,owner,kudzu,ro 0 0

The added line looked like this but gets deleted on reboot:

/dev/sda1 /mnt/thumbdrive auto,user rw 0 0

Thanks for any help
J Black

Hmm. I was under the impression that if you left "kudzu" out of the option list, that kudzu would not mess with it. I think kudzu is removing the line.

Unfortunately, I'm out of ideas. Sorry.

Cheers,
--
Bob McClure, Jr.             Bobcat Open Systems, Inc.
robertmcclure earthlink net  http://www.bobcatos.com
Man's disappointments are sometimes God's appointments.


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After a little trial and lots of error, I find that adding the line
noted below works. It allows a user to mount and umount the
thumbdrive. I've called it usbkey and also did a mkdir /mnt/usbkey.
The added line in fstab is


/dev/sda1 /mnt/usbkey vfat noauto,user,rw 0 0

Thanks Robert, your advice pushed me in the right direction.

It's not kudzu that's causing the problem. With USB, it depends on when the drives and other items on the USB bus show up. The first USB storage device will be /dev/sda, the second will be /dev/sdb and so on. If you change the order of things on the USB bus between reboots, the drive letters will change (sda may become sdb and so on).

Is there a fix?  Not really, beyond using labels on the filesystems
and in the /etc/fstab.  As everyone knows, I'm not a fan of filesystem
labels (certainly not on system directories such as "/" or "/usr"), but
for removable storage drives such as USB or Firewire, I suppose they
have their uses.
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens vitalstream com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-         The Navy's a bunch of wimps!  MY job's an adventure!       -
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