This 1600BPI magnetic tape unit was completed in May 1969, ahead of other companies.
This unit had twice the recording density of units previously produced by Hitachi. The memory capacity for one magnetic tape was about 40Mbyte— twice that of the previous 800BPI tape—so the number of tapes was reduced. In easy-to-understand terms, the specifications were as follows: information was recorded with a recording density of 1600BPI (approx. 63 characters per 1mm) on magnetic tape with 732m in one reel, and information could be processed (read/written) at a speed of 12,000 char/s.
| Model name | H-8453 | H-8451 |
|---|---|---|
| Magnetic tape used | Width 1/2inch,Length 2400feet | |
| Number of tracks | 9 | |
| Recording density(BPI) | 1600 | |
| Tape speed (inch/s) | 75 | 37.5 |
| Data transfer speed (KB/s) | 120 | 60 |
| Tape drive system | Single capstan,vacuum column system | |
| Number of decks/unit | 2 | |
