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DMS IMG
File conversion

Convert DMS to IMG

Verified by Adam B.· reviewed by FE Editorial ·updated Sep 6, 2026
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Is it possible to convert DMS to IMG?
Yes - DMS converts to IMG.

Run xdms u disk.dms to produce disk.adf, a raw 880 KB Amiga disk image; rename it to .img if your tool requires that extension. The file content is identical regardless of which extension is used.

Also to IMG: KDZ · DD · UDF

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert DMS to IMG?

A .dms file (Amiga Disk Masher System) is a compressed snapshot of a Commodore Amiga floppy. Decompressing it produces a flat, sector-by-sector dump of the disk - the same thing a generic .img raw disk image is. The standard Amiga term for this output is .adf, but .adf and a raw .img of the same disk are interchangeable; renaming the extension changes nothing in the file.

How to convert DMS to IMG

xDMS OPEN-SOURCE

Run xdms u disk.dms - xDMS decompresses the Amiga disk image and writes disk.adf; rename the output to .img if your tool requires that specific extension.

WinUAE FREE

Load the .dms in WinUAE as a floppy drive, then use WinUAE's disk-image save option to export the decompressed raw image, renaming from .adf to .img as needed.

About these formats

.DMS Amiga Disk Masher System Image

A DMS file is a compressed snapshot of a Commodore Amiga floppy disk, created by the Disk Masher System in the early 1990s. Open it with WinUAE (Windows) or FS-UAE (Mac/Linux), or first…

Open .DMS details →
.IMG Raw Disk/Disc Image

An IMG file is most often a raw, sector-by-sector copy of a CD/DVD, floppy, USB stick, or partition -- frequently identical to an ISO file. On Windows 8 and later, right-click and choose…

Open .IMG details →

Quality & what to watch

  • A decompressed Amiga .dms is always exactly 880 KB - the full contents of a double-density 3.5" Amiga floppy including the bootblock; no data is lost.
  • Renaming .adf to .img changes only the extension - the binary content is identical and tools accepting either extension will read the file correctly.
  • Verify the file is a genuine Amiga DMS image: it must begin with DMS! (hex 44 4D 53 21) at offset 0; the .dms extension is also used by unrelated software.

Frequently asked questions

Is .adf the same as .img for an Amiga disk?
Functionally yes - both are raw sector-by-sector disk images; for an Amiga disk the content is identical regardless of the extension.
Do I need an Amiga emulator to convert?
No - xDMS is a standalone command-line tool that decompresses .dms to .adf without any emulator.
Will the .img file work in Amiga emulators?
Yes - emulators such as WinUAE and FS-UAE accept raw disk images regardless of whether the extension is .adf or .img.
My .dms file is refused by xDMS - why?
The file likely does not start with DMS! - it may be a different file sharing the extension, such as a MIDI editor file or a BYOND scripting file.