FACOM 602 Magnetic Tape Unit

Recording density of the unit was a low 133bpi (bits per inch), but Fujitsu later developed the FACOM 602 which increased this recording density to 333bpi, and also allowed reading of tapes written with the FACOM 601. With this tape drive system, it was impossible to prevent shock to the tape during starting and stopping, but reliability was ensured by using sandwich tape. However, recording resolution was poor, and it was extremely difficult to improve recording density.