Product manual

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