Physical Description; Electrical Description; Performance Characteristics - Control Data Corporation BR8 SERIES Hardware Maintenance Manual

1.3.1 PHYSICAL DESCRlPTION
The physical dimensions for the equipment are as follows:
Height
Width
Depth
Weight
4.97 inches (126. 2mm)
8.78 inches (223.0mm)
14.24 inches (361.7mm)
12 lbs. (5.44 kgm)
1 .3.2 ELECTRICAL DESCRIPTION
The electrical specifications for the equipment are as follows:
• DC Power Source (Supplied by HOf;;t Equipment)
Without Stepper-Power Reduction
+24 Volts (± 10%)
@
1.·3 A Typical
+ 5 Volts
(±
5%)
@ O.
8 A Typical
With Stepper-Power Reduction
r
1.
3A Typical, Stepping
+24V (±10%)
@
{O. 3A Typical, Not Stepping
+ 5V (:!: 5%)
@
1.0 A Typical, Not
St~pping
• A. C. Power Source - Refer to the FDD configurator or FDD nameplate
to determine A. C. Power requirements.
1 .3.3 PERFORMANC.E CHARACTERISTICS
The equipment specifications for the FDD are as follows:
1-2
• ACCESSING TIME
Maximum Access Time
Maximum One-Track Access Time
A verage Access Time
• RECORDING
770 ms
20 ms
263 ms
Mode
Density (nominal)
Double Freq. MFM
1836 B.PI(72.3 BPmm) 3672 BPI (144.6 BPmm) Outer Tracl(
3268 BPl(128.7 BPmm) 6536 BPI (257.3 BPmm) Inner Tract(
Data Transfer Rate
Bits/Byte
Bits/Track
Tracks
Sectors
• DATA CAPACITY
Bytes/Track
Bits/Track
Bits/Diskette
249, 984 bits/sec
8
41,664
77
Format Determined
5,208
41,664
3,208, 128
499, 968 bits/sec
8
83,328
77
Format Determined
10,416
83,328
6,416,25'6
77834769-K
c
(
'-.