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The Floppy Disk Museum: The Bootable Floppy edition!

Olivetti minidisc (1977 - early 1980s)

The Olivetti minidisc (not to be confused with the magneto-optical Sony MiniDisc of 1992) was a magnetic floppy disc format for data storage designed by Olivetti for use in its P6040 minicomputer of 1977 which had a built-in disc drive. The P6040 used

The disk drive used 2.5-inch mylar discs without a protective cover, capable of holding just 3 KB of data (which was ample considering the P6040 had only 1 KB of RAM for user data, though this could be expanded to 3 KB). The disk was single-sided and t

Unlike later floppy disks, data is not stored in tracks and sectors, but is stored in a single spiral track like a phonograph record. Reading or writing to the disk was done in a single operation, so writing to the disk overwrote all the existing conte

The limited capacity of the disk meant that a read or write of the entire disk could be carried out in between 6 and 11.5 seconds.

As well as the P6040, Olivetti used the minidisc in 1978 in its TES (Text Editing System) 401 word processing system, where capacity was increased to 7.5 KB, and in the Business Computer System models BCS 2020 and BCS 2030 of 1979.


Dimensions: 70 mm x 119.5 mm (outer packaging), 65 mm diameter (disc)

Capacity: 3 KB to 7.5 KB