Seagate ST2000NM0001 ユーザーズマニュアル

10

Constellation ES.1 SAS Product Manual, Rev. A

This section provides detailed information concerning performance-related characteristics and features of Con-
stellation ES.1 drives.

 

 

Drive capacity

2TB

1TB

500GB

(formatted, rounded off value)

Read/write data heads

8

4

2

Bytes per track

1,012,608

1,012,608

1,012,608

Bytes (average, rounded off values)

Bytes per surface

250,000

250,000

250,000

MB (unformatted, rounded off value)

Tracks per surface (total)

248,600

248,600

248,600

Tracks (user accessible)

Tracks per inch

237,000

237,000

237,000

TPI (average)

Peak bits per inch

1,523,000

1,523,000

1,523,000

BPI

 

Areal density

324

324

324

Gb/in

2

Internal data rate

95 - 212

95 - 212

95 - 212

MB/s (variable with zone)

Disc rotation speed

7200

7200

7200

rpm

Avg rotational latency

4.16

4.16

4.16

ms

See Section 12.4.1, "SAS physical interface" on page 64  and  the  SAS Interface Manual (part number 
100293071) for additional timing details.

1.

Execution time measured from receipt of the Command to the Response.

, 

Average

Typical

4

3

3.

Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as 
measured on a representative sample of drives.

,

4.

Access time = controller overhead + average seek time and applies to all data transfer commands.

 

Access to data = access time + latency time.

8.3

9.3

8.5

9.5

Single track

Typical

3,4

0.5

0.8

0.7

1.0

Full stroke

Typical

3,4

18

19

18.2

19.2

2.

Assumes no errors and no sector has been relocated.

1, 2