Seagate ST3146755SS ユーザーズマニュアル
Cheetah T10 SAS Product Manual, Rev. A
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah drives.
Cheetah drives.
4.1
Internal drive characteristics
ST3300555SS
ST3146755SS ST373355SS
Drive capacity
300.0
146.8
73.4
Gbytes (formatted, rounded off value)
*,**
Read/write data heads
8
4
2
Tracks per surface (total)
74,340
74,340
74,340
Tracks (user accessible)
Tracks per inch
125,000
125,000
125,000
TPI
Peak bits per inch
890k
890k
890k
KBPI
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.
**Rounded off value.
4.2
Seek time
See Section 9.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) 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