Hi Rich,
> I have a 1.2G data file as a disk image (*.img). What tools are available
> for converting this to the underlying file(s)? I tried mounting it (as root
> to /mnt/dvd) but without success.
What kind of disk image is it? You mentioned /mnt/dvd ... is it a DVD
image/iso? If it is a hard drive image, then most likely the easiest
way would be to mount the partition(s) within the disk.
Once you figure out what byte offset your partitions start at, you can
mount them by doing (as root):
# losetup -o ${OFFSET} /dev/loop0 /path/to/disk.img
# mount /dev/loop0 /partition/mount/point
To figure out the offset, there are several ways. You can use
'fdisk -l ...', but I find it cumbersome. If you install the
sleuthkit, it will provide a nice utility called 'mmls' which lists
partition tables. The offset output is always in 512 byte blocks.
Often the first partition on PCs is at block offset 63, so you might
find yourself running:
# losetup -o $((63*512)) /dev/loop0 /path/to/disk.img
An alternative approach to this is to instead load the kernel's
"loop" module with a non-zero max_part parameter. Then you can create
the loopback device without any offset parameter:
# losetup /dev/loop0 /path/to/disk.img
And from there, the kernel should automatically detect the partitions
and create extra devices named: /dev/loop0pN where 'N' is the
partition number (much like /dev/sda provides partitions /dev/sdaN).
Then you can just mount the /dev/loop0pN devices as you see fit.
HTH,
tim
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