Technical information

2.2.16 RRD42 Optical Compact-Disc Subsystem
The RRD42 is a 600-Mbyte optical CD reader that retrieves data in fixed-
length blocks from removable compact-disc media.
Functional Information
Interface SCSI-2, single-ended, asynchronous
To Q-bus systems through KZQSA storage adapter
Ordering Information
RRD42–AA Embedded disc drive with controller
RRD42–DA Tabletop model, with power supply
Performance
Seek time, average 400 millisecond, (typical)
Seek time, max full stroke 800 millisecend, (typical)
Rotational speed, innermost track 530 rpm
Rotational speed, outermost track 200 rpm
Start time 2.0 second (max)
Stop time 2.0 second (max)
Transfer rate, sustained 150 Kbytes/second
Transfer rate, burst 1.50 Mbytes/second (max)
Physical Specifications
Height 4.15 cm (1.62 in)
Width 14.60 cm (5.75 in)
Depth 20.80 cm (8.0 in)
Weight
–AA 1.30 kg (2.8 lb)
–DA 2.9 kg (6.30 lb)
Option Specifications 2–21