WorldWide LEADER in SEL/Gould/Encore Third Party Support!
| Home | Products | Systems | Services | What’s new |Parts book | About us | Search | Contents |
Secur-a-Stor SMD Disk Replacement
The Secur-a-stor disk system is a real-time SMD to ESDI interface converter with a built-in ESDI disk drive. The disk system consists of an SMD-to-ESDI interface adapter electronics board, a 5-1/4 inch ESDI fixed disk drive, front panel switches and indicators, rear panel SMD A and B dual port cable connectors, a fan and a power supply packaged in a 5-1/4 high 19 inch rack mountable chassis.
The Secur-a-stor disk system provides media removable capability via a disk drive mounted in a canister which slides into the chassis from the front and rests on slides attached to the chassis walls. All electrical connections between the drive unit and the main chassis are mad via a 96 pin DIN connector. A compact 5-1/4 inch drive can be handled easily as a removable unit. The DIN connector is a low insertion force (LIF) connector designed for high level of insertion cycle activity.
The Secur-a-stor 9766 SMD disk drive emulation allows the disk system to directly replace a removable pack CDC 9766 drive and operate compatibly with Encore, Class E and F, SMD disk controllers.
The disk system encrypts each sector
header field during disk format operations with a code unique to each
disk system. The encryption code is generated from a 4 hexidigit
thumbwheel switch on the front panel.
The two address mapping PROMS are physically located on a PC board in the disk canister assembly since the media defect information stored on these PROMS are unique to each drive. Thus, when the drive is removed from the disk chassis the defect list information stays with the drive.
The difference in the number of heads per cylinder, i.e., 15 and 19 heads per cylinder for WREN V and 9766 respectively, requires the WERNE V to perform seek operations necessitated by disk address mapping.