Seagate ST3450757FC ユーザーズマニュアル
10
Cheetah 15K.7 FC Product Manual, Rev. C
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.7 FC drives.
Cheetah 15K.7 FC drives.
5.1
Internal drive characteristics
ST3600057FC
ST3450857FC
ST3300657FC
ST3600957FC
ST3450757FC
ST3300557FC
ST3600857FC
ST3450657FC
ST3300457FC
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 performance characteristics
See Section 12.5, "FC-AL physical interface" on page 65 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
77767496) for additional timing details.
5.2.1
Access time
Not including controller overhead
2
(msec)
1
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.
,
Average
Typical
3.4
3.9
Single track
Typical
0.2
0.44
Full stroke
Typical
6.6
7.4
2.
Access to data = access time + latency time.
Read
Write