AT&T 3B2/300 Technical Reference Manual page 221

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WREN II 72-Megabyte Hard Disk (KS-23054,L2)
72-Megabyte Hard Disk Equipment Characteristics
Reliability.
Life
Error Rates
Physical.
Disk Type
Rotational Speed
Height
Width
Depth
Bytes/ Sector
Sectors /Track
Tracks/Cylinder
Cylinders
Formatted Size
Operational.
Interface
Transfer Rate
Latency
Seek Time
5 years or 40,000 hours
Recoverable (soft) read errors occur less than 1 in 10 10 bits transferred.
Unrecoverable (hard) read errors occur less than 1 in 10
12
bits
transferred.
5.25-inch, Winchester drive
3600 revolutions per minute
3.25 inches
5.75 inches
8.0 inches
512
18
9
923 Accessible, 925 Total
149,526 blocks (512 bytes)
ST-506
5.0 megabits per second (625 kilobytes per second)
8.33 milliseconds, average
35 milliseconds, average
85 milliseconds, maximum
EQUIPMENT DESCRIPTION 2-197