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Cheetah NS FC Product Manual, Rev. B
11
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah NS FC drives.
4.1 Internal drive characteristics
ST3400755FC ST3300955FC
Drive capacity* 400.0 300 Gbytes (formatted, rounded off value)
Read/write data heads 8 4
Tracks per surface (total) 92,200 92,200 Tracks (user accessible)
Tracks per inch 155,000 155,000 TPI
Peak bits per inch 979k 979k BPI
Areal density 151.7 151.7 Gbits/inch
2
Internal data rate 725 to 1,211 725 to 1,211 Mbits/sec (variable with zone)
Disc rotation speed 10k 10k rpm
Avg rotational latency 2.98 2.98 msec
*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 9.5, "FC-AL physical interface" on page 61 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
4.2.1 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 3.9 4.2
Single track Typical 0.35 0.52
Full stroke Typical 6.8 7.5