Question

185

Mount single partition from image of entire disk (device)

rated 0 times [ 185] [ 0] / answers: 1 / hits: 206084 / 2 Years ago, wed, may 4, 2022, 7:55:35

I made an image of my entire disk with

dd if=/dev/sda of=/media/external_media/sda.img

Now the problem is I'd like to mount an ext4 filesystem that was on that disk but

mount -t ext4 -o loop /media/external_media/sda.img /media/sda_image

obviously gives a superblock error since the image contains the whole disk (MBR, other partitions) not just the partition I need. So I guess I should find a way to make the disk image show up in the /dev/ folder...

Does anyone know how to do that?

PS: I can always dd back the image to the original disk, but that would be very inconvenient (I updated the OS and I'd like to keep it as it is)

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anatta

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answered 2 Years ago nstitutencert · Accepted Answer

Get the partition layout of the image

$ sudo fdisk -lu sda.img

...

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

...

  Device Boot      Start         End      Blocks   Id  System

sda.img1   *          56     6400000     3199972+   c  W95 FAT32 (LBA)

Calculate the offset from the start of the image to the partition start

Sector size * Start = (in the case) 512 * 56 = 28672

Mount it on /dev/loop0 using the offset

sudo losetup -o 28672 /dev/loop0 sda.img

Now the partition resides on /dev/loop0. You can fsck it, mount it etc

sudo fsck -fv /dev/loop0

sudo mount /dev/loop0 /mnt

Unmount

sudo umount /mnt

sudo losetup -d /dev/loop0