Seagate ST9500431SS ユーザーズマニュアル
10
Constellation SAS Product Manual, Rev. E
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Con-
stellation drives.
stellation drives.
5.1
Internal drive characteristics
ST9500430SS, ST9500431SS & ST9500432SS
Drive capacity
500
Gbytes (formatted, rounded off value)
Read/write data heads
6
Bytes per track
890,823
Bytes (average, rounded off values)
Bytes per surface
83,370
Mbytes (unformatted, rounded off value)
Tracks per surface (total)
123,148
Tracks (user accessible)
Tracks per inch
200,000
TPI (average)
Peak bits per inch
1,410,000
BPI
Areal density
283
Gbit/in
2
Internal data rate
75 - 142
Mbytes/sec (variable with zone)
Disc rotation speed
7,200
rpm
Avg rotational latency
4.16
msec
5.2
Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 56 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) for additional timing details.
5.2.1
Access time
Including controller overhead
2
1
1.
Execution time measured from receipt of the Command to the Response.
,
(msec)
Average
Typical
4
3
3.
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.
,
4.
Access time = controller overhead + average seek time and applies to all data transfer commands.
Access to data = access time + latency time.
8.2
8.6
8.0
8.4
Single track
Typical
3,4
0.5
0.7
0.5
0.7
Full stroke
Typical
3,4
17.55
18.02
17.35
17.82
2.
Assumes no errors and no sector has been relocated.
Not including controller overhead
1, 2
(msec)
Read
Write
Read
Write