Appendix B Specifications - NEC D2246 Maintenance Manual

8-inch winchester disk drive
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Appendix B
Specifications
Table B-1 Operating Specifications
FEATURE
SPECIFICATION
General
Start Time
Less than 30 seconds
Stop Time
Less than 20 seconds
Recording Mode
Modified Frequency Modulation (MFM)
Interface Mode
N onreturn-to-Zero (NRZ)
Head Positioning
Closed servo rotary actuator using a tri-pulse pattern
Basic Power Requirements (No Options)
Voltage and Current
+5 Vdc, 4.0 A
-5 Vdc, 0.5 A
+12 Vdc, 0.6 A
-12 Vdc, 0.5 A
+24 Vdc, 5.0 A (peak)
2.5 A (average running)
Power Dissipation
100W (average running)
150 W (peak starting, 20 seconds)
Heat Generation
86K calories/hour (average running)
B-1

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