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SEAGATE ENTERPRISE CAPACITY 3.5 HDD V4 SAS PRODUCT MANUAL, REV. A 10
4.0 PERFORMANCE CHARACTERISTICS
This section provides detailed information concerning performance-related characteristics and features of Enterprise Capacity 3.5 HDD v4
drives.
4.1 INTERNAL DRIVE CHARACTERISTICS
Drive capacity 6TB models 4TB models 2TB models (formatted, rounded off value)
Read/write data heads 12 8 4
Bytes/track 1,470,464 Bytes (average, rounded off values)
Bytes/surface 500,000 MB (unformatted, rounded off values)
Tracks/surface (total) 337,400 Tracks (user accessible)
Tracks/in 320,000 TPI (average)
Peak bits/in 2,011,000 BPI
Areal density 643 Gb/in
2
Internal data rate 2317 Mb/s (max)
Disk rotation speed 7200 RPM
Avg rotational latency 4.16 ms
4.1.1 Format command execution time
5xxE-byte sectors (minutes) 6TB models 4TB models 2TB models
Maximum (with verify)
1168.83 926.28 384.17
Maximum (without verify)
596.17 407.33 193.55
4KN-byte sectors (minutes) 6TB models 4TB models 2TB models
Maximum (with verify)
1185.62 791.38 393.65
Maximum (without verify)
597.35 411.48 200.73
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.
4.1.2 General performance characteristics
Minimum sector interleave 1 to 1
Maximum Internal data rate* 2.32 Gb/s
Sustained transfer rate 100 to 216 MiB/s **
SAS Interface maximum instantaneous transfer rate 1200MB/s* per port
(dual port = 2400MB/s*)
Logical block sizes
512 (default), 520, 524 or 528.
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 4.16ms
*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