Seagate STM380215AS DiamondMax 21 SATA Product Manual - Page 25

Seek time, Start/stop times, Power specifications

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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 5,000 measurements of seeks between random tracks, less overhead. Typical seek times (msec) Track-to-track Average Average latency: 500-320 GB STM3250820AS* Read Write

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DiamondMax 21 Serial ATA Product Manual, Rev. C
19
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 5,000 measurements of seeks between
random tracks, less overhead.
*Measured in performance mode.
**Measured in quiet 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.
2.7
Start/stop times
2.8
Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 4 on page 30.
500-320 GB
STM3250820AS*
STM3250824AS
STM3250310AS**
160 - 80 GB
STM340215AS**
Typical seek times (msec)
Read
Write
Read
Write
Read
Write
Read
Write
Track-to-track
<0.8
<1.0
<0.8
<1.0
<1.0
<1.2
<1.0
<1.2
Average
<8.5
<10.0
<8.0
<9.0
<11.0
<12.0
<11.0
<12.0
Average latency:
4.16
500-320 GB
STM3250824AS
STM3250820AS
STM3250310AS
160 - 40 GB
Power-on to Ready (sec)
15 (max)
11 (max)
11 (max)
7.9 (max)
Standby to Ready (sec)
15 (max)
11 (max)
15 (max)
7.9 (max)
Ready to spindle stop (sec)
10 (max)
12 (max)
10 (max)
10 (max)