Gentoo Archives: gentoo-user

From: Etaoin Shrdlu <shrdlu@×××××××××××××.org>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Corrupt USB pen drive
Date: Fri, 18 May 2007 08:57:34
In Reply to: Re: [gentoo-user] Corrupt USB pen drive by Mick
1 On Friday 18 May 2007 10:29, Mick wrote:
3 > On Thursday 17 May 2007 23:27, Etaoin Shrdlu wrote:
4 > > IIRC, that is not the right syntax for mounting a loopback
5 > > filesystem. If /tmp/r1 is the file containing the filesystem, try
6 > >
7 > > mount -o loop /tmp/r1 /mnt/somewhere
8 > >
9 > > and make sure you have support for loopback devices in your kernel.
10 >
11 > Thanks for all the suggestions. I tried the correct mount loopback
12 > command on /dev/loop2 and I'm getting this error that mentions
13 > /dev/loop0 (how does this work?):
14 > ======================================
15 > # mount -t vfat -o loop /dev/loop2 /tmp/r1
16 > mount: wrong fs type, bad option, bad superblock on /dev/loop0,
17 > missing codepage or other error
18 > In some cases useful info is found in syslog - try
19 > dmesg | tail or so
20 > ======================================
22 You still seem to be missing the correct syntax. (note: this might not
23 solve your problem, and even issuing the right command might be of no
24 help, but since you asked for it, here it is).
26 With every mount command, you have to specify at least two things: *what*
27 to mount, and *where* to mount it, in this order. *Where* is usually a
28 path to some (preferably empty) directory. *what* can be various things,
29 depending on what you're trying to mount. For regular disk partitions,
30 it's usually a device file (eg, /dev/sda1). For NFS, it's a string of
31 the form remote_host:/remote/path. For loopback filesystems (ie,
32 filesystems contained in a single file), it's the name of the container
33 file, like your /tmp/r1. When mounting loopback filesystems, the "-o
34 loop" option must be given. The "-o loop" option accepts some optional
35 parameters. One of these is the specification of the loopback device
36 that should be used.
37 To explicitly specify a loopback device, use "-o loop=/dev/loopX". If no
38 loopback device is specificed, then mount will automatically pick an
39 unused loopback device (probably /dev/loop0). Your command
41 # mount -t vfat -o loop /dev/loop2 /tmp/r1
43 uses an incorrect syntax for the specification of the loopback device
44 (which is optional anyway), and does not tell where to mount the
45 filesystem. So, what you probably want is
47 # mount -t vfat -o loop=/dev/loop2 /tmp/r1 /mnt/somewhere
49 or just simply
51 # mount -t vfat -o loop /tmp/r1 /mnt/somewhere
52 --
53 gentoo-user@g.o mailing list


Subject Author
Re: [gentoo-user] Corrupt USB pen drive Mick <michaelkintzios@×××××.com>