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I've tried to do

mount -o loop file.img /mnt/img

but it asks me the mount: you must specify the filesystem type

then I could edit and unmount normally

umount /mnt/img/

How do I check the filesystem type? it is a RAID disk.

I've used

df -T

and the result is

udev           devtmpfs    1279476      4     1279472   1% /dev

Is devtmpfs a filesystem type?

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Which typ of RAID? Software or Hardware? Where comes the disc from? –  frlan Feb 13 '14 at 9:47
It is from a NAS Raid 5 that I trying to recover –  Joe Feb 13 '14 at 9:52
mount -o loop -t auto file.img /mnt/img –  Avinash Raj Feb 13 '14 at 9:52
the same answer, you must specify the filesystem type –  Joe Feb 13 '14 at 9:53
A single disc from raid5 will not work. –  frlan Feb 13 '14 at 10:13

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