This unit was developed to meet the need for automation, improved space efficiency and lower price for peripheral equipment, and was commercialized in 1979 for use with the HITAC M Series.
This was a completely new memory system enabling storage ranging from 35GB (gigabytes) in the smallest configuration to 236GB in the largest configuration. The memory media was magnetic tape cartridges with a capacity of 50MB (megabytes) each.
The main features were as follows:
- Automatic loading of media (Automated handling of magnetic tape cartridges stored in storage case)
- Automation of file management (Mechanization of centralized management of data)
- Random access to large volumes of data (Introduced concept of a virtual memory device)
- Reduced memory cost (Achieved a bit cost close to magnetic tape combined with random access capability)
- High-reliability design (Employed duplication of hardware and new error correction theory)
|Equipment model name||H-8523 High-Capacity Storage System|
|Max. memory capacity||35GB–236GB (*1)|
|Max. number of stored cartridges||706–4,720 (*1)|
|Data transfer speed||874 KB/s(Instantaneous max.)/ 371 KB/s(Effective)|
|Access time||Stripe search time : 11 msec–13s
Load/unload time: Approx. 5s
Cartridge movement time: 2.6 s-7.6 s
|Equipment external dimensions||Width :4,623mm–9,186mm (*1)
|Data cartridge||Type of recording media||Magnetic tape (Housed in cylindrical cartridge)|
|Recording density||Equivalent to 7,023BPI|
|Recording system||ZM modulation system|
|Connected systems||HITAC-M Series|
*1: The max.imum number varies depending on the equipment configuration.