Completed in June 1969, the FACOM 463K was a disk file unit from Fujitsu which employed a removable media housing a single 14-inch disk inside a cartridge, and a fixed head system.
This unit was developed as a high-speed, high-capacity auxiliary memory unit and external memory unit for the FACOM 230-10D small computer (an improved model of the FACOM 230-10) by using the results and knowledge obtained with the FACOM 631A/B magnetic disk unit. A maximum of 3 units could be connected to the DFC (Disk File Channel) of the FACOM 230-10D.
The heads of this unit were the air floating type, and 36 heads were fastened around the entire cartridge. Each head was equipped for 2 tracks, and data on 72 tracks could be accessed without moving a head. Therefore the system had high-speed access times like a magnetic drum. Average access time with 60Hz drive was 16.7ms. The cartridge had a disk with diameter of 37cm and a weight of approximately 1.5kg, and the memory capacity of one side was 131,072 bytes. Both sides of the disk could be used by remounting the disk.
| Completion date | June 1968 |
|---|---|
| Memory capacity | 131,072bytes (8bits/byte) |
| Capacity per track | 2,048bytes |
| Capacity per record | 256bytes |
| Number of records/track | 8 |
| Number of tracks/side | 72tracks |
| Average access time | 16.7ms(60Hz)/20ms(50Hz) |
| Disk rotation speed | 1,800rpm (60Hz)/1,500rpm(50Hz) |
| Data transfer speed | 73.7 Kbyte/s(60Hz) / 61.3 Kbyte/s(50Hz) |
| Connected system | FACOM 230-10D |
