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10 Savvio 10K.4 SAS Product Manual, Rev. E
5.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
5.1 Internal drive characteristics
ST9600204SS ST9450404SS
ST9600104SS ST9450304SS
ST9600004SS ST9450204SS
Drive capacity 600 450 GB (formatted, rounded off value)
Read/write data heads 6 6
Bytes per track 677,557 677,557 Bytes (average, rounded off values)
Bytes per surface 100,021 75,016 MB (un
formatted, rounded off value)
Tracks per surface (total) 147,620 1
10,715 Tracks (user accessible)
Tracks per inch 240,000 180,000
TPI (average)
Peak bits per inch 1,430 1,430 kBPI
Areal density 343 257.4 Gb/in
2
Internal data rate 1.62 1.62 Gb/s (variable with zone)
Disc rotation speed 10K 10K rpm
Avg rotational latency 3.0 3.0 ms
5.2 Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 61 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1 Access time
Including controller overhead
2
(ms)
1
1. Execution time measured from receipt of the Command to the Response.
,
Average
600GB
Typical
43
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 0.50 0.76 0.30 0.56
Full stroke 8.01 8.38 7.81 8.18
Average
450GB
Typical
3,4
4.0 4.6 3.8 4.4
Single track 0.50 0.76 0.30 0.56
Full stroke 7.96 8.51 7.76 8.31
2. Assumes no errors and no sector has been relocated.
Not including controller overhead
1,2
(ms)
Read Write Read Write