Physical Characteristics; Seek Time; Start/Stop Times - Seagate Constellation ES Product Manual

2.5

Physical characteristics

Weight: (maximum)
2TB models
1TB models
500GB models
Cache buffer
2.6

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)
Track-to-track
Average
Average latency:
*Measured in performance mode.
These drives are designed to consistently meet the seek times represented in this manual. Physical
Note.
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.
2.7

Start/stop times

Power-on to Ready (sec)
Standby to Ready (sec)
Ready to spindle stop (sec)
8
710g (1.565 lb)
640g (1.411 lb)
610g (1.345 lb)
64MB (64,768KB)
Read Write
0.5 0.8
<8.5 <9.5
4.16
2TB models
15 (max)
15 (max)
20 (max)
Constellation ES Serial ATA Product Manual, Rev. D
1TB models
10 (max)
10 (max)
500GB models
7 (max)
7 (max)