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Cheetah 73LP FC Product Manual, Rev. D 9
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 73LP FC drives.
4.1 Internal drive characteristics
ST373405FC/FCV ST336605FC/FCV
Drive capacity 73.4 .......................... 36.7..................................Gbytes (formatted, rounded off value)
Read/write data heads 8 ............................... 4
Bytes per track 397,385 .................... 397,385............................Bytes (average, rounded off values)
Bytes per surface 12,100 ...................... 12,100..............................Mbytes (unformatted, rounded off value)
Tracks per surface (total) 29,549 ...................... 29,549..............................Tracks (user accessible)
Tracks per inch 38,000 ...................... 38,000..............................TPI
Peak bits per inch 474 ........................... 474...................................KBPI
Internal data rate 399-671 .................... 399-671............................Mbits/sec (variable with zone)
Disc rotation speed 10,041 ...................... 10,041..............................rpm (+
0.5%)
Avg rotational latency 2.99 .......................... 2.99..................................msec
4.2 Seek performance characteristics
4.2.1 Access time
4.2.2 Format command execution time for ≥ 512-byte sectors
Including controller overhead
1
,
2
(msec)
1. Execution time measured from receipt of the FCP Command to the FCP Response.
2. Assumes no errors and no sector has been relocated.
Not including controller overhead
1,2
(msec)
Read Write Read Write
ST373405FC
Average Typical
3
,
4
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.
5.3 5.7 5.1 5.5
Single track Typical
3,4
0.6 0.8 0.4 0.6
Full stroke Typical
3,4
9.6 10.0 9.4 9.8
ST336605FC
Average Typical
3,4
4.9 5.4 4.7 5.2
Single track Typical
3,4
0.6 0.8 0.4 0.6
Full stroke Typical
3,4
8.8 9.3 8.6 9.1
ST373405FC/FCV ST336605FC/FCV
Maximum (with verify) 120 minutes 90
Maximum (without verify) 60 minutes 45