This was a series of high-capacity, high-performance, space-saving, energy-saving magnetic disk units for the EX830II, EX840II and EX850II general-purpose computer systems announced by Mitsubishi Electric in 1988. Memory capacity per unit ranged from a minimum of 0.63Gbyte (E1880B) to a maximum of 5GB (E1880D), and capacity could be selected or expanded in 0.63GB units.
These units had the following features:
- Data processing capacity was improved by reducing head positioning time from the previous 16ms to 13ms, and achieving a data transfer speed of 3Mbyte/s.
- Expansion was easy. Expansion could be done in 0.63Gbyte units, and expansion of device cross call functions could be done at the customer's installation location.
- Greater compactness was achieved by using 8.8-inch magnetic disks, and adopting a modular structure with 0.63Gbyte units. Twice the capacity (5Gbyte) could be installed in half the floor space of the previous machine (0.7m2).
- High-density recording at 21,500bit/inch and 1,060track/inch was achieved by combining a thin-film head with a high-performance coated disk, and improving recording/playback circuit technology.
|Equipment configuration||Number of spindles/unit||8|
|Media configuration||Cylinders/actuator||885 + alternate 1|
|Recording system||2-7 RLLC|
|Performance||Positioning time||Average 13ms|
|otational delay||Average 8.29ms|
|Data transfer speed||3Mbyte/s|
(With built-in device controller)
(Without built-in device controller)