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The Commodore 4040 and its sibling(s), the 2040 and the European marketed 3040, were dual unit 5¼" floppy disk drives for Commodore International computers. They used a wide case form, and used the IEEE-488 interface common to Commodore PET/CBM computers.
These drive models used a similar single density, single side floppy data storage format to that used by the Commodore 1541 drive, but with a slightly different data marker indicating which model originally formatted the disk. The low level disk format was similar enough to allow reading between models, but different enough that one series of drive models could not reliably write to disks formatted with one of the other model series.
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