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10 Constellation ES.2 SAS Product Manual, Rev. D
5.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Constellation ES.2 drives.
5.1 Internal drive characteristics
ST33000650SS
ST33000651SS
ST33000652SS
Drive capacity 3 TB (formatted, rounded off value)
Read/write data heads 10
Bytes per track 1,419,776 Bytes (average, rounded off values)
Bytes per surface 300,000 MB (un
formatted, rounded off value)
Tracks per surface (total) 284,399 Tracks (user accessible)
Tracks per inch 270,000 TPI (average)
Peak bits per inch 1,638,000 BPI
Areal density 444 Gb/in
2
Internal data rate 68.7 - 155 MB/s (variable with zone)
disk rotation speed 7200 rpm
Avg rotational latency 4.16 ms
5.2 Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 55 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1 Access time
Not including controller overhead
2
(ms)
1
1. Execution time measured from receipt of the Command to the Response.
,
Average 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.
8.3 9.3 8.5 9.5
Single track Typical
3,4
0.5 0.5 0.7 0.7
Full stroke Typical
3,4
15.5 16.2 15.7 16.4
2. Assumes no errors and no sector has been relocated.
Including controller overhead
1, 2
(ms)
Read Write Read Write