Seagate ST9300653SS ユーザーズマニュアル
Savvio 15K.3 SAS Product Manual, Rev. A
11
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
vio drives.
5.1
Internal drive characteristics
ST9300653SS
ST9146853SS
ST9300553SS
ST9146753SS
ST9300453SS
ST9146653SS
Drive capacity
300
146
GB (formatted, rounded off value)
Read/write data heads
4
2
Tracks per surface (total)
107,400
107,400
Tracks (user accessible including spare tracks)
Tracks per in
273,000
273,000
KTPI (average)
Peak bits per in
1601
1601
KBPI
Areal density
448
448
Gb/in
2
Internal data rate
1554 - 2267
1554 - 2267
Mb/s (variable with zone)
Disk rotation speed
15K
15K
RPM
Avg rotational latency
2.0
2.0
ms
5.2
Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) for additional timing details.
5.2.1
Access time
Including controller overhead
1
,
2
(ms)
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
(ms)
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.
2.9
3.3
2.7
3.1
Single track
Typical
3,4
0.4
0.6
0.2
0.4
Full stroke
Typical
3,4
5.3
5.7
5.1
5.5