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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.
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.
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.
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