In October 1981, NEC announced the N7716 cartridge magnetic tape unit for OEM. It employed magnetic tape with a width of 1/4 inch and length of 450 feet, and was designed as a backup unit for small systems.
In October 1982, NEC announced the N7740 cartridge magnetic tape unit which doubled the number of tracks to 8.
|Number of tracks||4||8|
|Memory capacity (MB)||16||40|
|Recording density (BPI)||7700|
|Tape speed (inch/s)||90|
|Rewind time (s)||60|
|Data transfer speed (kB/s)(per track)||86.6|
|Height (mm)×Width (mm)||117×220||117×220|