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SEAGATE ENTERPRISE PERFORMANCE 15K HDD AND ENTERPRISE TURBO SSHD SAS PRODUCT MANUAL, REV. B 9
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Enterprise Performance 15K
HDD and Enterprise Turbo SSHD drives.
4.1 Internal drive characteristics
600GB Models 450GB Models 300GB Models
Drive capacity 600 450 300 GB (formatted, rounded off value)
Read/write data heads 6 6 4
Bytes per track 1081 1081 1081 Kbytes (avg, rounded off values)
Bytes per surface 100,000 75,000 75,000 MB (unformatted, rounded off values
Tracks per surface (total) 109 86/96 86/96 KTracks (user accessible) (4k or 512E / 512N)
Tracks per in 289 228/254 228/254 KTPI (average) (4k or 512E / 512N)
Peak bits per in 1761 1761 1761 KBPI
Areal density 509 402/448 402/448 Gb/in2 (4k or 512E / 512N)
Disk rotation speed 15K 15K 15K RPM
Avg rotational latency 2.0 2.0 2.0 ms
4.2 Seek performance characteristics
4.2.1 Format command execution time for 512-byte sectors (minutes)
600GB Models 450GB Models 300GB models
Maximum (with verify) 120 90 60
Maximum (without verify) 60 45 30
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 180 to 246 MiB/s 4k/5xxE **
160 to 217 MiB/s 5xxN **
SAS Interface maximum instantaneous transfer rate 600 MB/s* per port
(dual port = 1,200 MB/s*)
Logical block sizes
512 (default), 520, 524 and 528
4k - 4096 (default), 4160, 4192, and 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 2.0 ms
* 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