The SFD1001 floppy disk drive ( S ingle F loppy D isk 1001) is a 5.25- inch drive for the Commodore 8xxx series , which can also be used on the C64 with an IEEE-488 adapter . Internally it works with Commodore DOS version 2.5 or version 2.7.
Technically it is built like the CBM 8250 , but is a single drive with the housing of the 1541 . Like the CBM 8250, it uses the Group Coded Recording (GCR) recording method. It has a bus-compatible, parallel IEEE-488 connection.