Seagate ST3450802FC ユーザーズマニュアル
Cheetah NS 10K.2 FC Product Manual, Rev. B
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah NS 10K.2 FC drives.
Cheetah NS 10K.2 FC drives.
4.1
Internal drive characteristics
ST3600002FC
ST3450802FC ST3300602FC
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
1,347
1,347
1,347
kBPI
Areal density
225
225
225
Gbits/inch
2
Internal data rate
1.01 to 1.84
1.01 to 1.84
1.01 to 1.84
Gbits/sec (variable with zone)
disk rotation speed
10k
10k
10k
rpm
Avg rotational latency
2.98
2.98
2.98
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 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
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.
measured on a representative sample of drives.
,
Average
Typical
3.8
4.4
Single track
Typical
0.22
0.22
Full stroke
Typical
8.1
8.7
2.
Access to data = access time + latency time.
Read
Write