The files that contain the .mds file extension are information files that store information describing the formatting of a DVD or CD disc. The information that is contained within the MDS files includes data showing how the disc is organized and which tracks are located on the DVD or CD disc.
The MDS files do not contain any actual audio or video data in and of themselves. Instead, the MDS files are connected to an associated ISO or MDF file. The ISO or MDF files are the files that contain the actual data that the MDS file is used to reference.
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If you have additional information about the MDS file format or software that uses files with the MDS suffix, please do get in touch - we would love hearing from you.