Seagate ES.2 FC ユーザーズマニュアル
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.
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.
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).
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.
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