IBM Extended Density Format
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The IBM eXtended Density Format (XDF) is a way of formatting standard high-density 3.5" and 5.25" floppy disks to larger-than-standard capacities. It is supported natively by IBM's PC DOS versions 7 and 2000 and by OS/2 Warp 3 onward, using the XDF and XDFCOPY commands (directly in OS/2).
When formatted as XDF disks, 3.5" floppies can hold 1860 kB, and 5.25" floppies can hold 1540 kB, using different number of sectors as well as different sector size per track (not all sectors in the same track are of the same size).
Floppy distributions of OS/2 3.0, PC DOS 7 and onward used XDF formatting for most of the media set.
- 2M, a program that allows the formatting of high capacity floppy disks
- fdformat, a program that allows the formatting of high capacity floppy disks
- DMF, a high-density diskette format used by Microsoft
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