Once you downloaded a Raspberry PI *.img file you may have a reason to look inside the image. Here is a shot config on how you do it:
First get your image file:
# ls -lh
total 1.9G
-rw-r--r-- 1 root root 1.9G Apr 24 14:35 2013-02-09-wheezy-raspbian.img
Next, check the filesystem table with fdisk:
# fdisk -l 2013-02-09-wheezy-raspbian.img
Disk 2013-02-09-wheezy-raspbian.img: 1939 MB, 1939865600 bytes
255 heads, 63 sectors/track, 235 cylinders, total 3788800 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
Disk identifier: 0x00014d34
Device Boot Start End Blocks Id System
2013-02-09-wheezy-raspbian.img1 8192 122879 57344 c W95 FAT32 (LBA)
2013-02-09-wheezy-raspbian.img2 122880 3788799 1832960 83 Linux
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The important note to take from the above output is:
- Sector size: 512
- start block: img1: 8192 and img2: 122880
Now create a directory mount point for both images:
# mkdir img1 img2
When your mount point directories are ready, mount both images with the sector size and start block information you have gathered in previous step:
# mount 2013-02-09-wheezy-raspbian.img -o loop,offset=$(( 512 * 8192)) img1/
# mount 2013-02-09-wheezy-raspbian.img -o loop,offset=$(( 512 * 122880)) img2/
Confirm that both images are mounted:
# ls img1/
bootcode.bin config.txt fixup.dat issue.txt kernel.img start.elf
cmdline.txt fixup_cd.dat fixup_x.dat kernel_emergency.img start_cd.elf start_x.elf
# ls img2/
bin boot dev etc home lib lost+found media mnt opt proc root run sbin selinux srv sys tmp usr var
