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Cheetah 73FC Product Manual, Rev. C
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 73FC drives.
4.1
Internal drive characteristics
Drive capacity
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface
Tracks per inch
Peak bits per inch
Internal data rate
Disc rotation speed
Avg rotational latency
4.2
Seek performance characteristics
4.2.1
Access time
Average
Typical
Single track
Typical
Full stroke
Typical
1.
Execution time measured from receipt of the command to the FCP Response.
2.
Assumes no errors and no sector has been relocated.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
measured on a representative sample of drives.
4.
Access time = controller overhead + average seek time.
Access to data = controller overhead + average seek time + latency time.
Format command execution time for ≥ 512-byte sectors
4.2.2
Maximum (with verify)
Maximum (without verify)
ST173404FC
73.4 .......................... Gbytes (formatted, rounded off value)
24
215-248 .................... KBytes (average, rounded off values)
3,035 ........................ Mbytes (unformatted, rounded off value)
14,100 ...................... Tracks (user accessible)
18,145 ...................... TPI
334 ........................... kBPI
280-427 .................... Mbits/sec (variable with zone)
10,025 ...................... rpm (+ 0.5%)
2.99 .......................... msec
Including controller overhead (without
1
disconnect)
Read
3
4
,
6.05
3,4
0.8
3,4
14.2
ST173404FC
240 minutes
120 minutes
2
,
(msec)
Write
6.55
1.1
15.2
Not including controller overhead
1,2
(without disconnect)
(msec)
Read
Write
5.85
6.35
0.6
0.9
14.0
15.0
9
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