Developed at IBM's Hursley, England, laboratory under code name Dolphin it used the 5440 disk cartridge.

Developed at IBM's Hursley, England, laboratory under the code name Gulliver with an initial capacity of 5MB.

Developed at IBM's Hursley, England, laboratory under the code name Piccolo with an initial capacity of up to 65MB, it used six 8-inch disks ( 210 mm ).

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