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Seagate Enterprise Capacity 2.5 HDD v3 SAS Product Manual, Rev. D 13
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Enterprise Capacity 2.5 HDD v3
drives.
4.1 Internal drive characteristics
2TB models 1TB models
Drive capacity 2000 1000 GB (formatted, rounded off value)
Read/write data heads 10 5
Bytes per track 979 979 KBytes (avg, rounded off values)
Bytes per surface 200,000 200,000 MB (unformatted, rounded off value)
Tracks per surface (total) 197 197 Ktracks (user accessible, rounded off values) (4096N, 512E or 512N)
Tracks per inch 315 315 KTPI (average) (4096N, 512E or 512N)
Peak bits per inch 1889 1889 KBPI
Areal density 585 585 Gb/in2 (4096N, 512E or 512N)
Disk rotation speed 7.2K 7.2K rpm
Avg rotational latency 4.167 4.167 ms
4.2 Performance characteristics
4.2.1 Format command execution time for 512-byte sectors (minutes)
2TB models 1TB models
Maximum (with certify)
652 326
Maximum (without certify)
326 163
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to
the Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
4.2.2 General performance characteristics
Sustained transfer rate 130 MiB/s **
136MB/s
SAS Interface maximum instantaneous transfer rate 1200 MB/s* per port
(dual port = 2400 MB/s*)
Logical block sizes
512E & 512N - 512 (default), 520,524, or 528
4096N - 4096 (default), 4160, 4192, or 4224
Read/write consecutive sectors on a track Yes
Flaw reallocation performance impact (for flaws reallocated at format time using the
spare sectors per sparing zone reallocation scheme.)
Negligible
Average rotational latency 4.167ms
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.
** MiB/s x 1.048 = MB/s