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General Information
7901A
Table 1-1. HP 7901A Disc Drive Specifications
DEVICE TYPE
Moving head disc drive with 1 removeable, front-loading, single-disc cartridge with 2200 bpi recording surface.
DATA ACCESS
Head Positioning (Including Settling Time)
Track-to-Track (maximum)
67 tracks (maximum)
202 tracks (maximum)
Rotational Delay (Latency)
Average (1/2 revolution)
Maximum (1 revolution)
Data Transfer
Eight-Bit Bytes/Second.
Bits/Second (nominal) .
Cartridge Change at 60 Hz Power
Stop Time
Start Time.
.
.
.
.
.
.
DATA CAPACITY
Approximately 24 million bits structured as follows when in 24-sector format:
TOTAL
DATA
DATA
APPROXIMATE
BITS
BITS
BYTES
SECTORS
TRACKS
PER
PER
PER
PER
PER
Byte
8
8
Sector
2.6k
2k
256
Track
60k
50k
6k
24
Cylinder
120k
100k
12.5k
48
2
Surface
12M
10M
1.25M
4.8k
200
+
3
Drive
24M
20M
2.5M
9.6k
400
ENVIRONMENTAL
Operating Temperature
Non-OperatingTemperature
.
.
.
.
.
Relative Humidity (Without Condensation)
CYLINDERS
PER
200
+
3
200
10 milliseconds
35 milliseconds
65 milliseconds
12.5 milliseconds
25.0 milliseconds
312k
2.5 million
35 seconds
30 seconds
RECORDING
SURFACE
PER
2
.10° to 40°C
50° to 104°F
_20° to 65°C
_4° to 149°F
8% to 95%
Attitude (pitch and Roll) .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. Accuracy of positioning is not af-
fected by attitude of the disc drive.
1-2
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