Mount a Bochs disk image

Posted by Sylvester Rac on Saturday, April 18. 2020

We can mount a bochs disk image from Linx with the following command:

sudo mount -t msdos -o loop,offset=32256 disk.img /mnt/bochs/

The offset of 32256 is correct if the image was created with the Bochs Disk Image Creator, but how can the offset be calculated?

sudo fdisk -l -u disk.img

Disk disk.img: 99.9 MiB, 104767488 bytes, 204624 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: 0x00000000

Device    Boot Start    End Sectors  Size Id Type
disk.img1 *       63 204623  204561 99.9M  6 FAT16

This shows us that the partition starts at the 63rd block. Each sector is 512 bytes, giving an offset of 512 * 63 or 32256 bytes.

More information

http://bochs.sourceforge.net/doc/docbook/user/loop-device-usage.html

https://www.redhat.com/archives/bochs-developers/1999-February/msg00018.html

http://www.julienlecomte.net/blog/2007/07/3/index.html

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