Specifications B-5
HARD DISK SPECIFICATIONS
Specifications for the hard disk drives are given in Table Appendix B -5.
Table Appendix B -5 Specifications for 270-, 340-, and 420-MB Hard Disk Drives
Features 270-MB 340-MB 420-MB
Physical Configuration
Formatted Capacity 270.4 MB 341.3 MB 425.3 MB
Actuator Type Rotary
voice-coil
Rotary
voice-coil
Rotary
voice-coil
Number of Disks 1 2 2
Data Heads 2 4 4
Servo Embedded Embedded Embedded
Tracks per Inch (tpi) 3300 tpi 2481 tpi 2985 tpi
Bytes per Block 512 512 512
Blocks per Drive 528,192 666,600 830,760
Dimensions 1.0 x 4.0 x
5.75 in.
1.0 x 4.0 x
5.75 in.
1.0 x 4.0 x
5.75 in.
Weight 1.2 lb 1.12 lb 1.12 lb
Performance
Track-to-track
Average read
Average write
4.0 ms
11 ms
2
13 ms
2
4.0 ms 4.0 ms
Average Latency 6.67 ms 9.0 ms 9.0 ms
Rotation Speed 4500 rpm 3322 rpm 3314 rpm
Data Rate Transfer
Buffer to host
6.0 MB/s
sustained)
11.0 MB/s (burst)
5.75 MB/s 5.75 MB/s
Start/Stop Cycles 50,000 min 20,000 min 20,000 min
Inerleave 1 : 1 1 : 1 1 : 1
Read Cache Adaptive,
Segmented
— —
Write Cache Yes — —
Interface IDE IDE IDE
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