Seagate ST450MX0064 - 512E ユーザーズマニュアル

S

EAGATE 

E

NTERPRISE 

P

ERFORMANCE 

15K HDD 

AND 

E

NTERPRISE 

T

URBO 

SSHD SAS P

RODUCT 

M

ANUAL

, R

EV

. B

 

 9

  

This section provides detailed information concerning performance-related characteristics and features of Enterprise Performance 15K 

HDD and Enterprise Turbo SSHD drives.

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

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.

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