IMGMOUNT

(excerpt from official DOSBox Readme)

IMGMOUNT

A utility to mount disk images and CD-ROM images in DOSBox.

IMGMOUNT DRIVE [imagefile] -t [image_type] -fs [image_format]
-size [sectorsbytesize, sectorsperhead, heads, cylinders]

imagefile

Location of the image files to mount in DOSBox. The location can be on a mounted drive inside DOSBox, or on your real disk. It is possible to mount multiple (e.g. "~/images/CD1.cue ~/images/CD2.cue [...] ~images/CDn.cue") CD-ROM images (ISOs or CUE/BIN) as well, if you need CD swapping capabilities specify all images in succession. The CDs can be swapped with CTRL-F4 at any time.

-t

The following are valid image types:

floppy

Specifies a floppy image or images. DOSBox will automatically identify the disk geometry (360K, 1.2MB, 720K, 1.44MB, etc).

iso

Specifies a CD-ROM iso image. The geometry is automatic and set for this size. This can be an iso or a cue/bin.

hdd

Specifies a harddrive image. The proper CHS geometry must be set for this to work.

-fs

The following are valid file system formats:

iso

Specifies the ISO 9660 CD-ROM format.

fat

Specifies that the image uses the FAT file system. DOSBox will attempt to mount this image as a drive in DOSBox and make the files available from inside DOSBox.

none

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

-size

The Cylinders, Heads and Sectors specification of the drive. Required to mount hard drive images. An example how to mount CD-ROM images:

1. "mount c /tmp"
2. "imgmount d c:\myiso.iso -t iso" or (which also works):
3. "imgmount d /tmp/myiso.iso -t iso"

(excerpt from official DOSBox Readme)