Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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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
10.13 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 FEATURES command in detail. This feature set uses the following
functions:
•
A SET FEATURES subcommand to enable Advanced Power Management
•
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 contains the
current Advanced Power Management level if it is enabled.
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