Seagate ST250VT000 ユーザーズマニュアル
S
EAGATE
V
IDEO
2.5 HDD P
RODUCT
M
ANUAL
, R
EV
. A
6
D
RIVE
S
PECIFICATIONS
2.5
S
EEK 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:
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.
2.6
S
TART
/
STOP TIMES
Table 3
Start/stop times
Typical seek times (ms)
Typical
Max @ 25
°
C
Power-on to ready
3.0
4.0
Standby to ready
2.5
3.0
2.7
P
OWER
S
PECIFICATIONS
).
2.7.1
Power consumption
Power requirements for the drives are listed in the table in
. Typical power measurements are based on an average of drives
tested, under nominal conditions, at 25°C ambient temperature. These power measurements are done with Interface Power
Management modes like HIPM and DIPM enabled.
Management modes like HIPM and DIPM enabled.
Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.
Seek mode
During seek mode, the read/write actuator arm moves toward a specific position on the disk surface and does not execute a read or
write operation. Servo electronics are active. Seek mode power is measured based on three random seek operations every 100 ms.
This mode is not typical.
During seek mode, the read/write actuator arm moves toward a specific position on the disk surface and does not execute a read or
write operation. Servo electronics are active. Seek mode power is measured based on three random seek operations every 100 ms.
This mode is not typical.
Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations every 100 ms.
Read/write power is measured with the heads on track, based on three 63 sector read or write operations every 100 ms.
Idle mode power
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track location.
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track location.
Standby mode
During standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write electronics are in
power-down mode.
During standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write electronics are in
power-down mode.
Table 2
Typical seek times
Typical seek times (ms)
Read
Track-to-track
1.5
Average
12.0
Average latency
5.6
N
OTE
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.
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.