Seagate ST9146802SS ユーザーズマニュアル
Savvio 10K.2 SAS Product Manual, Rev. D
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
vio drives.
4.1
Internal drive characteristics
ST9146802SS ST973402SS
Drive capacity
146.8
73.4
Gbytes (formatted, rounded off value)
Read/write data heads
4
2
Bytes per track
489,984
489,984
Bytes (average, rounded off values)
Bytes per surface
36,704
36,704
Mbytes (unformatted, rounded off value)
Tracks per surface (total)
75,373
75,373
Tracks (user accessible)
Tracks per inch
150,000
150,000
TPI (average)
Peak bits per inch
925,000
925,000
BPI
Areal density
135
135
Gbit/in
2
Internal data rate
660-1054
660-1054
Mbits/sec (variable with zone)
Disc rotation speed
10k
10k
rpm
Avg rotational latency
3.0
3.0
msec
4.2
Seek performance characteristics
See Section 9.4.1, "SAS physical interface" on page 56 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) for additional timing details.
4.2.1
Access time
Data sheet data except full stroke which was Gen 2.0 data.
Including controller overhead
1
,
2
(msec)
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors and no sector has been relocated.
Not including controller overhead
1,2
(msec)
Read
Write
Read
Write
Average
Typical
3
,
4
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.
4.0
4.6
3.8
4.4
Single track
Typical
3,4
0.4
0.6
0.2
0.4
Full stroke
Typical
3,4
8.17
8.76
7.97
8.56