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5 physical characteristics, 6 seek time, 7 start/stop times – Seagate CONSTELLATION ES SERIAL ATA ST31000524NS User Manual

Page 13: Physical characteristics, Seek time, Start/stop times

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Constellation ES Serial ATA Product Manual, Rev. F

7

3.5

Physical characteristics

Maximum height

26.1mm (1.028 in)

Maximum width

101.6mm (4.000 +/- 0.010 in)

Maximum length

146.99mm (5.787 in)

Max weight

ST32000644NS

710g (1.565 lb)

ST31000524NS

640g (1.411 lb)

ST3500514NS

610g (1.345 lb)

Cache buffer

ST32000644NS

ST31000524NS and ST3500514NS


64MB (64,768KB)


32MB (32,768KB)

3.6

Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using
drive diagnostics. The specifications in the table below are defined as follows:

• Track-to-track seek time is an average of all possible single-track seeks in both directions.

• Average seek time is a true statistical random average of at least 5000 measurements of seeks between

random tracks, less overhead.

*Typical seek times (ms)

Read

Write

Track-to-track

0.5

0.8

Average

<8.5

<9.5

Average latency:

4.16

*Measured in performance mode.

Note.

These drives are designed to consistently meet the seek times represented in this manual. Physical
seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted
values. However, due to the manner in which these drives are formatted, benchmark tests that
include command overhead or measure logical seeks may produce results that vary from these
specifications.

3.7

Start/stop times

2TB models

1TB models

500GB models

Power-on to Ready (sec)

15 (max)

10 (max)

7 (max)

Standby to Ready (sec)

15 (max)

10 (max)

7 (max)

Ready to spindle stop (sec)

20 (max)

This manual is related to the following products: