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Cheetah 15K.7 SAS Product Manual, Rev. D 9
5.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.7 drives.
5.1 Internal drive characteristics
ST3600057SS ST3450857SS ST3300657SS
ST3600957SS ST3450757SS ST3300557SS
ST3600857SS ST3450657SS ST3300457SS
Drive capacity 600 450 300 Gbytes (formatted, rounded off value)
*
Read/write data heads 8 6 4
Tracks per inch 165,000 165,000 165,000 TPI
Peak bits per inch 1,361 1,361 1,361 KBPI
Areal Density 225 225 225 Gbits/inch
2
Internal data rate 1.49 - 2.37 1.49 - 2.37 1.49 - 2.37 Gbits/sec (max)
Disk rotation speed 15k 15k 15k RPM
Avg rotational latency 2.0 2.0 2.0 msec
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
5.2 Seek time
See Section 12.4.1, "SAS physical interface" on page 58 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1 Access time
Not Including controller overhead
1
,
2
(msec)
1. Typical access times are measured under nominal conditions of temperature, voltage, and
horizontal orientation as measured on a representative sample of drives.
2. Access to data = access time + latency time.
Read Write
Average Typical 3.4 3.9
Single track Typical 0.2 0.44
Full stroke Typical 6.6 7.4