Savvio SAS Product Manual, Rev. D
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
4.1 Internal drive characteristics
ST973401SS ST936701SS
Drive capacity 73.4 36.7 Gbytes (formatted, rounded off value)
Read/write data heads 4 2
Bytes per track 360,000 360,000 Bytes (average, rounded off values)
Bytes per surface 18,387 18,387 Mbytes (unformatted, rounded off value)
Tracks per surface (total) 51,052 51,052 Tracks (user accessible)
Tracks per inch 105 105 KTPI
Peak bits per inch 660 660 KBPI
Internal data rate 506-753 506-753 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
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.
4.2 4.6 4.0 4.4
Single track Typical
3,4
0.40 0.80 0.20 0.60
Full stroke Typical
3,4
8.3 8.8 8.1 8.6
