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GENERAL INFORMATION
Interface
HP-IL
HP Double Density Format
Encoding:
MFM
Rotational Speed:
600 RPM
Bit Density @ 600 RPM:
Track 79 (Inside track)
8717 BPI
Track Density:
135 tracks per inch
Tracks per Surface:
80
Surfaces used per disc:
2
Capacity
HP 110
Series 40 and 70
Bytes/Sector:
512
Max storage capacity will vary
Sectors/Track:
9
depending on the REV firmware
Bytes/Drive (Formatted):
710 Kbytes
used in the 40 and 70 series
products. Typical would be 128K
bytes.
NOTE
The HP 9114A spares 4 complete tracks. This reduces the
usable user space to 512*%09%*78*2 (bytes/sector times sec-
tor/track times unspared tracks times number of sides) This
total equals 718.848 Kbytes. Additionally, directories further
reduce usable user space. This, as implemented by HP, gener-
ally takes track 0. Actual usable space will be 718.848 Kbytes
minus track O for a total of 709.632 Kbytes.
Access Time
Track-to-Track Seek:
15 ms/track
plus 42 ms settling
Maximum Track-to-Track
Seek (80 tracks):
1242 ms
Average Track-to-Track:
447 ms
Maximum Rotational Latency:
100 ms
Average Rotational Latency:
50 ms
Spindle Motor on time:
400 ms
Maximum Data Access Time
(Seek plus Latency
plus Motor on time):
1742 ms
Average Data Access Time:
497 ms
Maximum Sustained Transfer
rate:
6 Kbytes/second
Maximum sustained transfer rate of the 9114 will be dependent on the number of devices contained within
the HP-IL loop. As more devices are added, the apparent data transfer rate decreases.
1-2
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