Re: Pendrive not mounted when another usb device is plugged in
On Sat, 2008-08-16 at 22:27 +0100, Rodolfo Medina wrote:
> Rodolfo Medina <rodolfo.medina@gmail.com> writes:
>
> >>> In my /etc/fstab there is the following entry:
> >>>
> >>> /dev/sda /mnt/sda vfat rw,user,noauto 0 0
> >>>
> >>> , so I normally mount my usb pendrive simply with:
> >>>
> >>> $ mount /mnt/sda
> >>>
> >>> . But, now that I have a usb umts modem (Huawei e169), when it is plugged
> >>> in I don't manage to mount the pendrive: the system claims that the medium
> >>> is `not found'. Then I have to unplug the modem and plug the pendrive in
> >>> again.
>
>
>
> Ron Johnson <ron.l.johnson@cox.net> writes:
>
> >> [...] in /etc/fstab I'd refer to that drive not as /dev/sda but by it's
> >> UUID.
>
>
>
>
> Rodolfo:
>
> > All right, I did so and now the mount problem seems to be fixed. But now,
> > when I want to unmount it, with: `umount /mnt/sda', the output is:
> > `Segmentation fault', and the drive is not unmounted.
> >
> > How to unmount it now?
>
>
> I have to unmount it as root. In fstab there is now:
>
> UUID=44F1-7D0C /mnt/sda vfat rw,user,noauto 0 0
>
> , but as a normal user I can only mount the device, not unmount it: to unmount
> it I must be root. Why this?
with user in fstab, the user that mounted should be able to umount it,
like Ron asked, what is your error?
>
> Another thing that is not clear to me is the difference between the `user' and
> `users' options of `mount' command.
This one is simple, user = a user can mount it, the SAME user can
umount it. users = a user can mount it, ANY user can umount it.
>
> But now I understand why the problem occurs trying to mount the drive when the
> umts device is already plugged in: for some reason, although the umts device
> is mapped into /dev/ttyUSB0, /dev/sda comes to be busy. So, if I add in fstab
> another line:
>
> /dev/sdb /mnt/sdb vfat rw,user,noauto 0 0
>
> , I can mount the pendrive on /mnt/sdb. But now I wish to use the UUID as
> normal user. Suggestions welcome.
>
> Bye
> Rodolfo
>
>
--
Damon L. Chesser
damon@damtek.com
http://www.linkedin.com/in/dchesser
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