Seagate ST3500620SS ユーザーズマニュアル
Barracuda ES.2 SAS Product Manual, Rev. E
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Bar-
racuda ES.2 SAS drives.
racuda ES.2 SAS drives.
4.1
Internal drive characteristics
ST31000640SS
ST3750630SS
ST3500620SS
Drive capacity
1,000
750
500
Gbytes (formatted, rounded value)
*
Read/write data heads
8
6
4
Tracks per inch
150,000
150,000
150,000
TPI
Peak bits per inch
1,090k
1,090k
1,090k
BPI
Areal Density
164
164
164
Gbits/inch
2
Internal data rate
1,287
1,287
1,287
Mbits/sec max (variable with zone)
Sustained data rate
116
116
116
Mbits/sec max (variable with zone)*
Disk rotation speed
7,200
7,200
7,200
rpm
Avg rotational latency
4.16
4.16
4.16
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 9.4.1, "SAS physical interface" on page 55 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
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.
horizontal orientation as measured on a representative sample of drives.
,
Average
Typical
7.4
8.5
Single track
Typical
0.4
1.0
Full stroke
Typical
14.3
15.4
2.
Access to data = access time + latency time.
Read
Write