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Cheetah 10K.6 FC Product Manual, Rev. B 9
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 10K.6 FC drives.
4.1 Internal drive characteristics
ST3146807FC...........ST373307FC..........ST336607FC
Drive capacity 146.8.........................73.3 ........................36.7 ........... Gbytes (formatted, rounded off value)
Read/write data heads 8................................4 .............................2
Bytes per track 368............................368 .........................368 ............ Kbytes (average, rounded off values)
Bytes per surface 1,835.........................1,835 ......................1,835 ......... Mbytes (unformatted, rounded off value)
Tracks per surface (total) 49,855.......................49,855 ....................49,855 ....... Tracks (user accessible)
Tracks per inch 64,000.......................64,000 ....................64,000 ....... TPI
Peak bits per inch 570............................570 .........................570 ............ KBPI
Internal data rate 475-841.....................475-841 .................. 475-841..... Mbits/sec (variable with zone)
Disc rotation speed 10,008.......................10,008 ....................10,008 ....... rpm (+
0.5%)
Avg rotational latency 2.99...........................2.99 ........................2.99 ........... msec
4.2 Seek performance characteristics
4.2.1 Access time
4.2.2 Format command execution time (in minutes)
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
Average Typical
3
,
4
3. Typical access times are measured under nominal conditions of temperature, voltage, and hor-
izontal 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.
4.90 5.50 4.70 5.30
Single track Typical
3,4
0.55 0.75 0.35 0.55
Full stroke Typical
3,4
9.20 9.70 9.00 9.50
ST3146807FC ST373307FC ST336607FC
Maximum (with verify)
180 90 45
Maximum (without verify)
90 45 30