Computer Personal Computer User Manual

CD-ROM specifications

m Disc diameter 120 millimeters (4.7 inches)

and 80 mm (3.1 inches)

m Scanning velocity 1.2–1.4 meters per second (normal speed)

m Rotation speed (varies over radius):

Normal speed ~530 to 230 revolutions per minute (rpm)

Double speed ~1060 to 460 rpm

Eight-times speed ~4240 to 1840 rpm

m Average latency (varies over radius):

Normal speed ~55 to 130 milliseconds (ms)

Double speed ~27.5 to 65 ms

Eight-times speed ~6.88 to 16.25 ms

m Blocks per rotation ~8.4 to 19.5 variable

m Average access time (typical):

Normal speed 380 ms

Double speed 270 ms

Eight-times speed 160 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