Product manual

Cheetah 15K.6 FC Product Manual, Rev. D
11
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.6 FC drives.
4.1 Internal drive characteristics
ST3450856FC ST3300656FC ST3146356FC
ST3450056FC ST3300056FC ST3146756FC
Drive capacity* 450 300 146 Gbytes (formatted, rounded off value)
Read/write data heads 8 6 3
Tracks per inch 150,000 150,000 150,000 TPI
Peak bits per inch 1,100k 1,100k 1,100k BPI
Areal density 165 165 165 Gbits/inch
2
Internal data rate 1.95 1.95 1.95 Gbits/sec (max)
Disc 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.
4.2 Seek performance characteristics
See Section 9.5, "FC-AL physical interface" on page 68 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 3.4 3.9
Single track Typical 0.20 0.44
Full stroke Typical 6.6 7.4