Mirror Disk File

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Mirror Disk File
Filename extension .mdf
Type of format Disc image
Media Descriptor
Filename extension .mds
Magic number MEDIA DESCRIPTOR
Type of format Sidecar file

Mirror Disk File (MDF) is a proprietary disc image file format developed for Alcohol 120%, an optical disc authoring program. Daemon Tools, MagicISO, PowerISO, and PowerDVD can also read the MDF format.[1] A disc image is a computer file replica of the computer files and file system of an optical disc. Such a replica of a file set, file system, or storage device is also called a mirror.

Unlike an ISO image, a Mirror Disk File can contain multiple layers (as used in dual-layer recording) and multiple optical disc tracks. Like the IMG file format, a Mirror Disk File is a "raw" image of an optical disc. The word raw implies that the copy is precise, bit-for-bit, including (where appropriate) file-system metadata.

A Mirror Disk File may be accompanied by a media descriptor sidecar file. This optional binary file (with file extension .mds) contains metadata about an imaged optical disc, including a delineation of where disc layers begin and end ("layer breaks"), and which portions of the MDF belong in which disc layer. The MDS file also stores the location and value of the layer breach bit, a CD/DVD copy protection mechanism. The MDS file is comparable to the CloneCD Control File and cue sheet (.cue) file formats. However, their capabilities are not identical; also the cue sheet is a text file format.

See also[edit]

References[edit]

  1. ^ ".MDF File Extension". FileInfo.com. 29 September 2009. Retrieved 11 December 2011. 

External links[edit]

Media Descriptor File. Retrieved 23 November 2013.