Apple Workgroup Server 8550 User Manual
Page 111
Specifications for the 600i CD-ROM drive
m
Disc diameter
120 millimeters (mm)
(5.25 inches) and 80 mm
m
Scanning velocity
1.2–1.4 meters per second
m
Rotation speed
Varies over radius
Normal speed
~530 to 230 revolutions per minute (rpm)
Double speed
~1060 to 460 rpm
Quadruple speed
~2120 to 920 rpm
m
Latency (average)
Varies over radius
Normal speed
~55 to 130 milliseconds (ms)
Double speed
~27.5 to 65 ms
Quadruple speed
~13.75 to 32.5 ms
m
Blocks per rotation
~8.4 to 19.5 variable
m
Average access time (typical)
Normal speed
380 ms
Double speed
270 ms
Quadruple speed
200 ms
Data
m
Data capacity
656 megabytes (MB), Mode 1
748 MB, Mode 2
m
Number of blocks per disc
336,150
m
Data per block
2048 bytes, Mode 1
2336 bytes, Mode 2
m
Address description
Minutes, seconds, blocks
Audio capacity
m
Playing time
74 minutes, 42 seconds
102
Appendix B / Technical Information