Seagate ST2000NX0323 ユーザーズマニュアル

Seagate Enterprise Capacity 2.5 HDD v3 SAS Product Manual, Rev. D

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

Bytes per track

979

KBytes (avg, rounded off values)

Bytes per surface

200,000

MB (unformatted, rounded off value)

Tracks per surface (total)

197

Ktracks (user accessible, rounded off values) (4096N, 512E or 512N)

Tracks per inch

315

KTPI (average) (4096N, 512E or 512N)

Peak bits per inch

1889

KBPI

Areal density

585

Gb/in2 (4096N, 512E or 512N)

Disk rotation speed

7.2K

rpm

Avg rotational latency

4.167

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