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Operating Times
Following are the DSU operating times:
Speed of rotation of discs
Effective bit transfer rate
Inner tracks
Outer tracks
Maximum latency time*
Average latency time
Average access time (latency time
plus positioning time)
PHYSICAL CHARACTERISTICS
The physical characteristics of the DSU are shown below:
Number of discs per file
Number of recording surfaces
Number of positioning arms
Number of read/write heads per positioning arm
Number of read/write heads per surface
Number of tracks per surface
Inner zone
Outer zone
Number of words per frame
Number of frames per track
Inner zone
Outer zone
Number of frames per surface
Number of frames per 16-disc file
Number of words per file
Number of bits per file
Information bits
Check word bits
Total number of bits per file
1200 rpm
250 kc
500 kc
52 ms
26 ms
199 ms
16
32
16
8
4
256
128
128
64
8
16
3,072
98,304
6,291,456
132,120,576
2,064,384
134,184,960
* Latency time is the time necessary for a piece of information to reach a read/write head as
the disc revolves.
@&u&~~uc:J ~@---------------
V-43
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