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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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