Hitachi HTS543216L9SA00 manual Operating modes, Mode transition time, Operating mode at power on

5K320 SATA OEM Specification

4.4.3Operating 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 media access requests. All
	electronic components remain powered and the full frequency servo remains
	operational.
	The device is capable of responding immediately to media access requests. Some
Active idle	circuitry—including servo system and R/W electronics—is in power saving mode.
	The head is parked near the mid-diameter the disk without servoing.
	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.
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.
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.

Table 10. Operating mode

4.4.3.1Mode transition time

From	To	Transition	Transition Time
		Time (typ)	(max.)
Standby	Idle	2.5	9.5

Table 11. Drive ready time

4.4.3.2Operating mode at power on

The device goes into Idle mode after power on or hard reset as an initial state..

4.4.3.3Adaptive 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.

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