Power-Up In Standby Feature Set - Hitachi HTS542525K9SA00 Specifications

10.12 Power-Up in Standby feature set

The Power-Up In Standby feature set allows devices to be powered-up into the Standby power management state to
minimize inrush current at power-up and to allow the host to sequence the spin-up of devices.
This feature set will be enabled and disabled via the SET FEATURES command or the use of a jumper. When
enabled by a jumper, the feature set shall not be disabled via the SET FEATURES command. The enabling of this
feature set shall be persistent after power cycle.
A device needs a SET FEATURES subcommand to spin-up to active state when the device has powered up into
Standby. The device remains in Standby until the SET FEATURES subcommand is received.
If power-up into Standby is enabled when an IDENTIFY DEVICE is received while the device is in Standby as a
result of powering up into Standby, the device shall set word 0 bit 2 to one to indicate that the response is incomplete,
only words 0 and 2 are correctly reported.
The IDENTIFY DEVICE information indicates the states as follows:
• identify device information is complete or incomplete
• this feature set is implemented
• this feature set is enabled or disabled
• the device needs the Set Features command to spin-up into active state
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