Files given the .mdf extension contain a disc image of the information that has been saved on a CD or DVD. MDF files are similar to ISO files, but they are saved in a different format. In order for the DVD or CD data to be played back properly, the MDF file must be saved with an associated MDS file.
The actual file data on the disc that the MDF file was copied from is stored in the file with the .mdf extension while the file with the .mds extension stores the disc's header and track information. These files allow you to play the media contained on a CD or DVD without having the actual disc in your computers CD or DVD drive.
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If you have additional information about the MDF file format or software that uses files with the MDF suffix, please do get in touch - we would love hearing from you.