Mounting a raw partition image made from dd

Inspect Image

sudo file sdcrd.img

sdcard.img: DOS/MBR boot sector; 

partition 1 : ID=0xc, start-CHS (0x40,0,1), end-CHS (0x3ff,3,32), 
startsector 8192, 524288 sectors; 

partition 2 : ID=0x83, start-CHS (0x3ff,3,32), end-CHS (0x3ff,63,32), 
startsector 532480, 30583808 sectors

sudo fdisk -l sdcard.img

Disk sdcard.img: 14.86 GiB, 15931539456 bytes, 31116288 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x999999999
Device Boot Start End Sectors Size Id Type

sdcard.img1 8192 532479 524288 256M c W95 FAT32 (LBA)
sdcard.img2 532480 31116287 30583808 14.6G 83 Linux

Mounting 1st Partition

Pay attention to the Start field.
Here we are wanting to mount the 1st Partition.
It starts at 8192.
So 8192 * 512 = 4194304

Mount Partition 1

sudo mount -o ro,loop,offset=4194304 sdcard.img /mnt/sdcardp1

Mounting 2nd Partition

Pay attention to the Start field.
Here we are wanting to mount the 2nd Partition.
It starts at 532480.
So 532480 * 512 = 272629760

Mount Partition 2

mount -o ro,loop,offset=272629760 sdcard.img /mnt/sdcardp2

Troubleshooting

While writing this was unable to mount the 2nd partition

mount: /mnt/sdcard: can’t read superblock on /dev/loop14.

It was be due the the disk not being dismounted properly before imaging.
To fix it

sudo losetup --offset 272629760 /dev/loop14 harddrive.img
sudo fsck /dev/loop14

sudo mount /dev/loop14 /mnt/loop14

Related

• DD Essentials