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MDF and MDS file pair

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Title: MDF and MDS file pair  
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MDF and MDS file pair

Filename extension .mdf
Type of format Disc image
Filename extension .mds
Type of format Disc image

An MDS/MDF file pair (Media Descriptor File) is a proprietary file format designed for the Alcohol 120% optical disc authoring program. MDF files contain a disc image with the contents of an optical disc such as a CD or a DVD.[1][2] An MDS accompanies each MDF file. It is an optional media descriptor file that contains metadata about the original media.[3][4]

MDS/MDF file pairs may be created by optical disc imaging applications such as Alcohol 120% and Daemon Tools. For a list of such software, see: Comparison of disc image software.


MDF files are in practice the same as BIN files in the CUE/BIN format and as IMG files in the CCD/IMG format.[5] All of them are raw disc images of the binary contents of an optical disc.

Similar to CUE and CCD files, MDS files are descriptor files that accompany the raw disk image (MDF in this case). The MDS format is a binary file that contains metadata such as the position of the layer breaks or layer breach bit, a property of the copy protection feature of optical discs. Magic number "MEDIA DESCRIPTOR" appears at the beginning of the file.


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