Seagate ST4000DX001 Manuel D’Utilisation
Desktop SSHD Product Manual, Rev. B
15
Drive Specifications
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:
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.
2.7
Start/stop times
Time-to-ready may be longer than normal if the drive power is removed without going through normal OS
powerdown procedures.
powerdown procedures.
* Hybrid time-to-ready specification assumes all needed data files are pinned to flash, Windows 8 environment, and fast BIOS implemented
2.8
Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to
2.8.1 Power consumption
,
based on an average of drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C
ambient temperature.
ambient temperature.
• Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating
speed.
speed.
• Read/write power and current
Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-ms delay,
then a 16-sector read followed by a 32-ms delay.
then a 16-sector read followed by a 32-ms delay.
• Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each 10
reads) and 20 percent drive idle mode.
reads) and 20 percent drive idle mode.
Typical seek times (ms)
Read
Write
Track-to-track
1.0
1.2
Average
8.5
9.5
Average latency
4.16
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.
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.
4-disk
(4TB )
(4TB )
2-disk
(2TB )
(2TB )
1-disk
(1TB )
(1TB )
Power-on to ready*
( in seconds)
( in seconds)
<1
<1
<1
Standby to ready*
(in seconds)
(in seconds)
<1
<1
<1
Ready to spindle stop
(in seconds)
(in seconds)
10 (typical)
11 (max)
11 (max)
10 (typical)
11 (max)
11 (max)
10 (typical)
11 (max)
11 (max)