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4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Exos 2X14 drives.
4.1
Internal drive characteristics
Drive capacity
Read/write data heads
Bytes/track
Bytes/surface
Tracks/surface (total)
Tracks/in
Peak bits/in
Areal density
Internal data rate
Disk rotation speed
Avg rotational latency
4.1.1
Format command execution time
Maximum (with verify)
Maximum (without verify)
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
Maximum Internal data rate*
Sustained transfer rate
SAS Interface maximum instantaneous transfer rate
Logical block sizes
4096
Read/write consecutive sectors on a track
Flaw reallocation performance impact (for flaws reallocated at format time using the spare
sectors per sparing zone reallocation scheme.)
Average rotational latency
*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
Seagate Exos 2X14 SAS Product Manual, Rev. D
14TB
16
1,738,365
875,000
479,400
420,000
2,358,000
965
2765
7200
4.16
4Kn-byte sectors (minutes)
1545
601
(formatted, rounded off value)
Bytes (average, rounded off values)
MB (unformatted, rounded off values)
Tracks (user accessible)
TPI (average)
BPI
2
Gb/in
Mb/s (max)
RPM
ms
1 to 1
2.7 Gb/s
114 to 250 MiB/s ** (per LUN)
1200MB/s* per port
Yes
Negligible
4.16ms
Performance characteristics
11
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