1        none: DOSBox will make no attempt to read the file system on the disk.
2              This is useful if you need to format it or if you want to boot
3              the disk using the BOOT command. When using the "none"
4              filesystem, you must specify the drive number (2 or 3,
5              where 2 = master, 3 = slave) rather than a drive letter.
6              For example, to mount a 70MB image as the slave drive device,
7              you would type (without the quotes):
8                "imgmount 3 d:\test.img -size 512,63,16,142 -fs none"
9                Compare this with a mount to be able to access the drive
10                within DOSBox, which would read as:
11                "imgmount e: d:\test.img -size 512,63,16,142"