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4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
4.1
Internal drive characteristics
Drive capacity
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface (total)
Tracks per inch
Peak bits per inch
Areal density
Internal data rate
Disc rotation speed
Avg rotational latency
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.
4.2.1
Access time
3
4
,
Average
Typical
3,4
Single track
Typical
3,4
Full stroke
Typical
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors and no sector has been relocated.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
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.
Data sheet data except full stroke which was Gen 2.0 data.
Savvio 10K.2 SAS Product Manual, Rev. B
ST9146802SS ST973402SS
146.8
73.4
4
2
489,984
489,984
36,704
36,704
75,373
75,373
150,000
150,000
925,000
925,000
135
135
660-1054
660-1054
10k
10k
3.0
3.0
Including controller overhead
(msec)
Read
4.0
0.4
8.17
Gbytes (formatted, rounded off value)
Bytes (average, rounded off values)
Mbytes (unformatted, rounded off value)
Tracks (user accessible)
TPI (average)
BPI
2
Gbit/in
Mbits/sec (variable with zone)
rpm
msec
1
2
,
Not including controller overhead
(msec)
Write
Read
4.6
3.8
0.6
0.2
8.76
7.97
1,2
Write
4.4
0.4
8.56
11
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