
A-4 Specifications
Table A-4 Specifications for Diskette Drives (cont’d)
Features
OSDA-90C 1.44-MB
FD1158C 1.2 MB (Optional)
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
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