Hitachi Travelstar 7K500 120GB HTS725012A9A361 사용자 설명서
제품 코드
HTS725012A9A361
7K500 OEM SPECIFICATION
Page 21 of 176
4.4.3
4.4.3
4.4.3
4.4.3
Operating modes
Operating modes
Operating modes
Operating modes
Operating mode
Description
Spin-Up
Start up time period from spindle stop or power down.
Seek
Seek operation mode
Write
Write operation mode
Read
Read operation mode
Performance idle
The device is capable of responding immediately to idle media access requests. All
electronic components remain powered and the full frequency servo remains
operational.
electronic components remain powered and the full frequency servo remains
operational.
Active idle
The device is capable of responding immediately to media access requests. Some
circuitry—including servo system and R/W electronics—is in power saving mode.
The head is parked near the mid-diameter the disk without servo.
A device in Active idle mode may take longer to complete the execution of a
command because it must activate that circuitry.
circuitry—including servo system and R/W electronics—is in power saving mode.
The head is parked near the mid-diameter the disk without servo.
A device in Active idle mode may take longer to complete the execution of a
command because it must activate that circuitry.
Low power idle
The head is unloaded onto the ramp position. The spindle motor is rotating at full
speed.
speed.
Standby
The device interface is capable of accepting commands. The spindle motor is
stopped. All circuitry but the host interface is in power saving mode.
The execution of commands is delayed until the spindle becomes ready.
stopped. All circuitry but the host interface is in power saving mode.
The execution of commands is delayed until the spindle becomes ready.
Sleep
The device requires a soft reset or a hard reset to be activated. All electronics,
including spindle motor and host interface, are shut off.
including spindle motor and host interface, are shut off.
Table 10. Operating mode
4.4.3.1
4.4.3.1
4.4.3.1
4.4.3.1 Mode transition time
Mode transition time
Mode transition time
Mode transition time
From
To
Transition
Time (typ)
Transition Time
(max.)
Standby
Idle
3.0
6.0
Table 11. Drive ready time
4.4.3.2
4.4.3.2
4.4.3.2
4.4.3.2 Operating mode at power on
Operating mode at power on
Operating mode at power on
Operating mode at power on
The device goes into Idle mode after power on as an initial state.
4.4.3.3
4.4.3.3
4.4.3.3
4.4.3.3 Adaptive power save control
Adaptive power save control
Adaptive power save control
Adaptive power save control
The transient timing from Performance Idle mode to Active Idle mode and Active Idle mode to Low Power
Idle mode is controlled adaptively according to the access pattern of the host system. The transient
timing from Low Power Idle mode to Standby mode is also controlled adaptively, if it is allowed by Set
Features Enable Advanced Power Management subcommand.
Idle mode is controlled adaptively according to the access pattern of the host system. The transient
timing from Low Power Idle mode to Standby mode is also controlled adaptively, if it is allowed by Set
Features Enable Advanced Power Management subcommand.