Seagate ST3146756FC (FDE) ユーザーズマニュアル
Cheetah 15K.6 FC Product Manual, Rev. C
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.6 FC drives.
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.
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
3.4
3.9
Single track
Typical
0.20
0.44
Full stroke
Typical
6.6
7.4