Specifications
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Feature Specification
Performance
Modes High Density Mode Normal Density Mode
Capacity 2 MB mode 1.6 MB mode 1.0 MB mode
Unformatted (MFM)
Per Disk 2.0 MB 1.667 MB 1.0 MB
Per Surface 1.0 MB 833,000 MB 500,000 MB
Per Track 12.500 MB 10.413 MB 6,250 MB
Formatted (MFM) 18 sectors per track 15 sectors per track 9 sectors per track
Per Disk 1,474,560 1,228.800 737,280
Per Surface 737,280 614,400 368,640
Per Track 9,216 7,680 4,608
Per Sector 512 512 512
Transfer Rate (MFM) 500 Kbps 500 Kbps 250 Kbps
Access Time
Track to Track 3 ms 3 ms 3 ms
Settling Time 15 ms 15 ms 15 ms
Average 79 ms 79 ms 79 ms
Average Latency 100 ms 83 ms 100 ms
Turn Around Delay (minimum) 18 ms minimum 18 ms minimum 18 ms minimum
Functional
Density High Density Normal Density
Capacity 2.0 MB mode 1.6 MB mode 1.0 MB mode
Motor Start Time 500 ms 500 ms 500 ms
Rotational Speed 300 rpm(typical) 360 rpm 300 rpm(typical)
Recording Density (MFM)
(Inner Most Track)		 17,434 bpi 14,527 bpi 8,717 bpi
Track Density 135,467 tpi 135,467 tpi 135,467 tpi
Cylinders 80 80 80
Tracks 160 160 160
Read/Write Heads 2 2 2
Power Requirements
Voltage 5 V ±10% Max ripple 110mVp-p
Operating Current Seek 0.55 A (maximum)
0.45 A (typical)
Read 0.35 A (maximum)
0.29 A (typical)
Write 0.35 A (maximum)
0.29 A (typical)
At motor start 0.71 A (maximum)
0.64 A (typical)
Power Consumption At motor start 3.9W (maximum)
3.2 W (typical)
Read 3.0 W (maximum)
2.3 W (typical)
Write 1.9 W (maximum)
1.5 W (typical)
Stand by 28 mW (maximum)
20 mW (typical)
Reliability
MTBF 30,000 POH typical
MTTR 30 minutes
Component life 15,000 POH or 5 years
Error rates
Soft read errors 1 per 109 bits read
Hard read errors 1 per 1012 bits read
Seek errors 1 per 106 bits read
Durability
Disk insertion/ejection 30,000 times
Seek 10x107
Media wear 3.5x106