Raw disk images of optical media (such as CDs and DVDs) contain a raw image of all the tracks in a disc (which can include audio, data and video tracks). In the case of CD-ROMs and DVDs, these images usually include not only the data from each sector, but the control headers and error correction fields for each sector as well. Since IMG files hold no additional data beyond the disk contents, these files can only be automatically handled by programs that can detect their file systems. Disc images of optical media are usually accompanied by a descriptor file which describes the layout of the disc, and includes information such as track limits which are not stored in the raw image file.įilename extensions and variantsįor instance, a typical raw disk image of a floppy disk begins with a FAT boot sector, which can be used to identify its file system.
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