NEC POWERMATE P60D - Page 180

B-4 Specification
DISKETTE DRIVE SPECIFICATIONS
Table B-4 lists the specifications for the diskette drives.
Table Appendix B -4 Specifications for Diskette Drives
Features OSDA-90C 1.44-MB FD1158C 1.2 MB
Storage Capacity
Unformatted 2.0 MB 1.67 MB
Formatted 1.44 MB 1.2 MB
Recording Density
Bit density 17,434 bpi 9870 bpi max
Track density 135 tpi 96 tpi
Number of Cylinders 80 80
Number of Tracks 160 (80 tracks x 2 sides) 160 (80 tracks x 2 sides)
Recording Method MFM MFM/FM
Disk Speed 300 rpm 360 rpm
Data Transfer Rate 500/250k bps 500/250k bps
Access Time
Average seek 94 ms 94 ms
Minimum seek 3 ms 3 ms
Head load Non-head load 35 ms max
Dimensions
Height 1.0 in. (25.4 mm) 1.0 in. (25.4 mm)
Width 4.9 in. (101.6 mm) 5.7 in. (146 mm)
Depth 5.9 in. (150 mm) 7.4 in. (190 mm)
Weight 1.0 lb (0.63 kg) 1.5 lb (0.67 kg)
Operating Temperature 41° to 113°F (5° to 45°C) 39° to 115°F (4° to 46°C)
Relative Humidity
Tolerance Range
20% to 80% 20% to 80%
Power
+12 Vdc Not Used 1.19 A (start up)
+5 Vdc 0.87 A (start up) 0.09 A (start up)
Power Consumption 1.5 W (operating) 2.6 W (operating)
Error Rate
Recoverable 1 per 10
-9
1 per 10
-9
Non-recoverable 1 per 10
-12
1 per 10
-12
Seeks 1 per 10
-6
1 per 10
-6
Mean Time Between
Failures
12,000 hours 12,000 hours