mount / umount

Bruce Evans bde at
Tue Jan 6 12:45:10 PST 2004

On Tue, 6 Jan 2004, Fabrizio Parrella wrote:

> I mount a msdos floppy disk with:
> mount -tmsdos /dev/fd0 /mnt/floppy
> and everything works fine..
> when I tried to umount, I got this:
> umount: unmount of /mnt/floppy failed: Resourde temporary =A0unavailable
> # fd0: hard error cmd=3Dwrite fsbn 19 (ST0 40<abnrml> ST1 2<write_protect=
> ST2 0
> cyl 0 hd 1 sec 2

It's not writable, so you need to mount it with option ro.

msdosfs used to have the nice property of not scribbling on disks unless
there is a write() or chmod() etc. on the disk, but it now always writes
to the FAT for non-ro mounts to clear the clean flag.

> PLUS, if I try to mount the floppy disk by an user and not as root, I get=
> message:
> msdosfs: /dev/fd0: Operation not permitted

Various things prevent user mounts (see another reply), and non-clean
disks should now prevent read-write mounting.  I'm not sure if this works


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