Product number for the microdrive cassette, a removable endless loop tape cartridge capable of storing at least 85k bytes of program, data, or memory images organized as files. The tape cartridge holds 200 inches of magnetic tape that moves at 30 inches per second when necessary to perform read/write/search functions. Data is recorded on the tape in two tracks in an FM format at approximately 3333 bpi achieving a data rate of approximately 12.5k bytes per second. Sectoring is completely soft with a sector length of 512 formatted data bytes.
Never released: this description comes from the TS2060 Interface Product Specification document.