The KL-10 used RP06 or RP20 disk drives. Up to 8 disks per MASSBUS. (Each RP20 spindle counts as 2 disks.)
The disk subsystems provide high performance and reliability. Disk features include accurate server positioning, error correction, and offset positioning recovery. Table 7-1 summarizes the capactities and speeds of the disk devices.
To support the performance and reliability features of the system's disk devices, the operating system's disk device drivers provide comprehensive error recovery algorithms (for example, ECC and offset recovery for disk) and log all device errors.
Disk controllers allow several drives to preforma simultaneous seek operations. Since the controller is not busy during seek operations, data transfers on one drive can overlap seeks in progress on other drives. If more than one drive is on the same controller, overlapped seeks will accelerate processing for the disks on that controller. Overlapped seeks increase throughput by decreasing the effective access time.
|RP20||Non-removable||967 Mb||1200||25||8.33||MASBUSS||4 *|
|* Two spindles per drive. K = 1,024; M = 1,000,000|
RM03 and RP06 disk drives can be mised on the same RH11 controller on a
KS10; however they can not be mised within the same logical file structure.
Each RP20 data module has fifteen recording surfaces with two read/write
heads per surface and a transfer rate of 1.2 megabytes per second with a 25 ms
averate access time. Each data module may transfer independently with the