Power-Up In Standby Feature Set; Advanced Power Management Feature Set (Apm) - Hitachi CinemaStar P7K500 Specifications

8.11 Power-up in Standby feature set

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/disabled via the SET FEATURES command or use of 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, then 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

8.12 Advanced Power Management feature set (APM)

This feature allows the host to select an advanced power management level. The advanced power
management level is a scale from the lowest power consumption setting of 01h to the maximum
performance level of FEh. Device performance may increase with increasing advanced power management
levels. Device power consumption may increase with increasing advanced power management levels. The
advanced power management levels contain discrete bands, described in the section of Set Feature
command in detail. This feature set uses the following functions:
1. A SET FEATURES subcommand to enable Advanced Power Management
2. A SET FEATURES subcommand to disable Advanced Power Management
Advanced Power Management is independent of the Standby timer setting. If both Advanced Power
Management and the Standby timer are set, the device will go to the Standby state when the timer times out
or the device's Advanced Power Management algorithm indicates that the Standby state should be entered.
The IDENTIFY DEVICE response word 83, bit 3 indicates that Advanced Power Management feature is
supported if set. Word 86, bit 3 indicates that Advanced Power Management is enabled if set. Word 91, bits
7-0 contain the current Advanced Power Management level if Advanced Power Management is enabled.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
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