Seagate ST3146855FC ユーザーズマニュアル
Cheetah 15K.5 FC Product Manual, Rev. D
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.5 FC drives.
Cheetah 15K.5 FC drives.
4.1
Internal drive characteristics
ST3300655FC
ST3146855FC ST373455FC
Drive capacity*
300.0
146.8
73.4
Gbytes (formatted, rounded off value)
Read/write data heads
8
4
2
Bytes per track
74,340
74,340
74,340
Bytes (average, rounded off values)
Tracks per inch
125,000
125,000
125,000
TPI
Peak bits per inch
890k
890k
890k
BPI
Areal density
110
110
110
Gbits/inch
2
Internal data rate
960 to 1607
960 to 1607
960 to 1607
Mbits/sec (variable with zone)
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 64 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
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.
and horizontal orientation as measured on a representative sample of drives.
2.
Access to data = access time + latency time.
Read
Write
Average
Typical
3.5
4.0
Single track
Typical
0.2
0.4
Full stroke
Typical
6.8
7.5