On Tue, 2 Jun 2009, Petr Uzel wrote:-

On Tue, Jun 02, 2009 at 03:29:40PM +0200, Koenraad Lelong wrote:

...

Hi, Last year I made a diskimage of a CF-hard-disk using dd. Now I have some problems booting that disk so I want to investigate the differences. However, I can't mount that diskimage with "mount -o loop diskimage /mnt". I think it's because the image contains two partitions. Is it possible to mount such an image ?

Try running 'parted -s diskimage unit B print' to see where each partition starts/ends.

Then you could

a) extract the partition with dd to another file, which should be mountable with mount -o loop ...

or

b) use device-mapper linear mapping to access the partition (man dmraid).

Another alternative is to tell mount the offset to the partitions boot sector. E.g. for a 2GiB virtual drive containing a couple of file systems: playing:/local2 # parted -s disc.img unit B print Model: (file) Disk /local2/disc.img: 2147483648B Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32256B 172730879B 172698624B primary ext2 , , , , , , , , , type=83, , 2 172730880B 2146798079B 1974067200B primary ext3 , , , , , , , , , type=83, , In this case, I could mount the individual file systems by using: playing:/local2 # mkdir -p temp/mnt{1,2} playing:/local2 # mount disc.img temp/mnt1 -o loop,offset=32256 playing:/local2 # mount disc.img temp/mnt2 -o loop,offset=172730880 playing:/local2 # df /local2/temp/mnt* Filesystem 1K-blocks Used Available Use% Mounted on /local2/disc.img 163322 1550 153340 2% /local2/temp/mnt1 /local2/disc.img 1897452 35636 1765428 2% /local2/temp/mnt2 Regards, David Bolt -- Team Acorn: http://www.distributed.net/ OGR-NG @ ~100Mnodes RC5-72 @ ~1Mkeys/s openSUSE 10.3 32b | openSUSE 11.0 32b | | openSUSE 10.3 64b | openSUSE 11.0 64b | openSUSE 11.1 64b | RISC OS 3.6 | RISC OS 3.11 | openSUSE 11.1 PPC | TOS 4.02 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

On Wed, 03 Jun 2009 08:42:43 +0200, Koenraad Lelong wrote:

David Bolt schreef:

...

Number Start End Size Type File system

Flags

...

1 32256B 172730879B 172698624B primary ext2 , , , , , , , , , type=83, , 2 172730880B 2146798079B 1974067200B primary ext3 , , , , , , , , , type=83, ,

In this case, I could mount the individual file systems by using:

playing:/local2 # mkdir -p temp/mnt{1,2} playing:/local2 # mount disc.img temp/mnt1 -o loop,offset=32256 playing:/local2 # mount disc.img temp/mnt2 -o loop,offset=172730880 playing:/local2 # df /local2/temp/mnt* Filesystem 1K-blocks Used Available Use% Mounted on /local2/disc.img 163322 1550 153340 2% /local2/temp/mnt1 /local2/disc.img 1897452 35636 1765428 2% /local2/temp/mnt2

Regards, David Bolt

Guys, you rock, thanks. That's what I like about linux. The downside about it is you have to keep on learning, but I don't complain :-)

As a side note, you can use kpartx to detect the partition offsets, and automatically create the corresponding device nodes in /dev/mapper/. Example: GizMo:/home/zly # kpartx -av test.img add map loop0p1 (253:0): 0 96327 linear /dev/loop0 63 add map loop0p2 (253:1): 0 96390 linear /dev/loop0 96390 add map loop0p3 (253:2): 0 96390 linear /dev/loop0 192780 add map loop0p4 (253:3): 0 96390 linear /dev/loop0 289170 GizMo:/home/zly # ls /dev/mapper/ control loop0p1 loop0p2 loop0p3 loop0p4 You can then work on /dev/loopX as the disk, and /dev/mapper/loopXpX as the individual partitions. Kind regards Sylvester Lykkehus -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org