how to identify filesystem type

Hi,

I need your help, in understanding filesystems. Kindly let me know how to identify the filesystem in an image file or block device.

thanks in advance and regards,

Pankaj Agarwal

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Hi Pankaj,

if you've got an image file called somefs.img you
should be able to do:

file somefs.img

If you've got a block device - say /dev/hda1 - then you'll need to do the following (probably as root). Be careful to type this command correctly or you could be in a world of pain

    dd if=/dev/hda1 bs=1k count=5 | file -

A
DO NOT USE dd WITH ANYTHING UNDER /dev WHILE RUNNING AS ROOT UNLESS YOU REALLY, REALLY HAVE TO.

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Sorry for the typo, the command to check a block
device such as /dev/hda1 is:

    dd if=/dev/hda1 bs=1k count=5 | file -

Regards,

ippi

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hi,

it doesn't provide the information seeked....i am enclosing the output below...

# file /mnt/hda5/hdstg2.img

/mnt/hda5/hdstg2.img: data

# dd if=/dev/hdc1 bs=1k count=5 | file -

standard input: data

5+0 records in

4+0 records out

# file -s /dev/hdc{,1,2,3,4,5,6,7,8,9,10}

/dev/hdc: x86 boot sector

/dev/hdc1: data

/dev/hdc2: x86 boot sector, extended partition table

/dev/hdc3: empty

/dev/hdc4: empty

/dev/hdc5: data

/dev/hdc6: data

/dev/hdc7: data

/dev/hdc8: Linux/i386 swap file version 1 (4K pages) size 63999 pages

/dev/hdc9: data

/dev/hdc10: empty

kindly suggest more about it...

thanks, Pankaj

----- Original Message -----
From: "ippi" <[email protected]>
To: "Pankaj Agarwal" <[email protected]>; <[email protected]>
Sent: Thursday, August 19, 2004 1:43 PM
Subject: Re: how to identify filesystem type

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I see what you mean. I created a reiserfs filesystem and file only recognised it as data. If the block devices are all hard disk partitions you should try fdisk:

fdisk -l

Also, if you're interested in the filesystems of
block devices that are already mounted, then just
type:

mount

I don't know what is on the image /mnt/hda5/hdstg2.img but you could try to mount it and see if it's recognised. Just do the following:

mkdir mp
mount -v -o loop /mnt/hda5/hdstg2.img mp

I take it you are sure that there are filesystems on these devices and that they are not corrupted!

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