Digital Equipment RW504-ZA, Service Manual

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Performance Specifications
Optical Disk Library System
Capacity 16 disks
10.4 Gbytes (RW504) or
20.8 Gbytes (RW524)
Drives 1, 5.25-inch multifunc-
tion 650-Mbyte (RW504)
or 1.3-Gbyte (RW524)
optical disk drive
Average disk exchange time (excluding
drive load/unload sequences) 7 seconds
Interface Single-ended asyn-
chronous SCSI
Multifunction Optical Drives
650 Mbytes 1.3 Gbytes
Rotational speed 3600 rpm 2400 rpm
Average seek 25 ms 23.5
Short stroke seek (across 2.2 Mbytes) 8 ms 4 ms
Full stroke seek 50 ms 45 ms
Single track seek (track-to-track) 2 ms 2 ms
Average rotational delay 8.33 ms 12.5 ms
Bias magnet rotation time 8 ms (maximum) 8 ms (maximum)
Average access time 35 ms
Burst transfer rate 3 Mbytes/s (asyn-
chronous) 3 Mbytes/s
(asynchronous)
5 Mbytes/s (syn-
chronous) 5 Mbytes/s
(synchronous)
Data transfer rate (host dependent) 1 Mbyte/s (read) .8-1.6 Mbyte/s
(read)
.5 Mbytes/s (write) .4-.8 Mbytes/s
(write)
Load time (including spin-up) 2.5 seconds (average) 2.3 seconds
(average)
Unload time (including spin-down) 2.0 seconds (average) 1.4 seconds
(average)
1–8 Introduction