Distribution Media Format

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Distribution Media Format (DMF) is a format for floppy disks that Microsoft used to distribute software. It allowed the disk to contain 1.68 MB of data on a 3½-inch disk, instead of the more standard 1.44 MB. As a side effect, utilities had to specially support the format in order to read and write the disks, which made software piracy of products distributed on this media more difficult.

Comparison of DMF and standard 1.44MB 3½-inch diskettes:

1.44MB DMF
Tracks 80 80
Sectors per track 18 21
Cluster size 512 bytes 1024 or 2048 bytes
Root directory entries 224 16

[edit] Competing formats

[edit] External links

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