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Barracuda ES.2 FC Product Manual, Rev. B
11
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Bar-
racuda ES.2 FC drives.
4.1 Internal drive characteristics
ST31000640FC
Drive capacity* 1,000 Gbytes (formatted, rounded off value)
Read/write data heads 8
Tracks per inch 150,000 TPI
Peak bits per inch 1,090k BPI
Areal density 164 Gbits/inch
2
Internal data rate 1,287 Mbits/sec (variable with zone)
Disc rotation speed 7,200 rpm
Avg rotational latency 4.16 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 56 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
4.2.1 Access time
4.2.2 Format command execution time (minutes)
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request
for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
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 7.4 8.5
Single track Typical 0.4 1.0
Full stroke Typical 14.3 15.4
ST31000640FC
Maximum (with verify) 400
Maximum (without verify) 200