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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.
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.
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.
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