Seagate ST3400755FC ユーザーズマニュアル
Cheetah NS FC Product Manual, Rev. B
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah NS FC drives.
Cheetah NS FC drives.
4.1
Internal drive characteristics
ST3400755FC
ST3300955FC
Drive capacity*
400.0
300
Gbytes (formatted, rounded off value)
Read/write data heads
8
4
Tracks per surface (total)
92,200
92,200
Tracks (user accessible)
Tracks per inch
155,000
155,000
TPI
Peak bits per inch
979k
979k
BPI
Areal density
151.7
151.7
Gbits/inch
2
Internal data rate
725 to 1,211
725 to 1,211
Mbits/sec (variable with zone)
Disc rotation speed
10k
10k
rpm
Avg rotational latency
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 61 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
3.9
4.2
Single track
Typical
0.35
0.52
Full stroke
Typical
6.8
7.5