This was an 8-inch hard disk unit commercialized by Mitsubishi Electric in 1985. It was equipped with a thin-film head, and thereby achieved high recording density and a high memory capacity of 408MB.
The features of this unit were as follows:
- 14,100BPI was achieved by combining a thin-film head with a coated disk, and using a 2-7 RLLC (Run Length Limited Coding) modulation system.
- An easy-to-use interface was provided by adding diagnostic functions to the mainstream SMD interface.
- It enabled high-speed data transfer at 1.81Mbyte/s.
- The units were compact, and two units could be mounted side-by-side in a 19-inch rack.
- High-reliability design enabling maintenance-free and inspection-free operation for 5 years or 20,000 hours, whichever came sooner.
| Unit memory capacity | 408.5MB |
|---|---|
| Side capacity | 31.43MB |
| Track capacity | 30,720byte |
| Number of disks | 8 |
| Number of memory capable sides | 13 |
| Number of cylinders | 1,023 + 1CE |
| Recording system | 2-7 RLLC |
| Bit density | 14,100bit/inch |
| Track density | 1,000track/inch |
| Data transfer speed | 14.52Mbit/s(1.815Mbyte/s) |
| Positioning time | Min. 4ms,Max. 37ms,Average 20ms |
| Rotational delay | Average 8.47ms |
| Rotation speed | 3,544rpm |
| External dimensions(Width x Height x Depth) | 216mm×259mm×650mm |
| Weight | 38kg |
