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8 Cheetah NS 10K.2 SAS Product Manual, Rev. C
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah NS SAS drives.
4.1 Internal drive characteristics
ST3600002SS ST3450802SS
Drive capacity 600 450 GB (formatted, rounded off value)
*
Read/write data heads 8 6
Tracks per inch 165,000 165,000 TPI
Peak bits per inch 1,347 1,347 kBPI
Areal Density 225 225 Gb/inch
2
Internal data rate 1.01 to 1.84 1.01 to 1.84 Gb/sec (variable with zone)
Disk rotation speed 10K 10K rpm
Avg rotational latency 2.98 2.98 ms
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
4.2 Seek performance
See Section 9.4.1, "SAS physical interface" on page 48 and the SAS Interface Manual (part number
100293071) for additional timing details.
4.2.1 Access time
Not Including controller overhead
2
(ms)
1
1. Typical access times are measured under nominal conditions of temperature, voltage, and
horizontal orientation as measured on a representative sample of drives.
,
Average Typical 3.8 4.4
Single track Typical 0.22 0.22
Full stroke Typical 8.1 8.7
2. Access to data = access time + latency time.
Read Write