HGST Travelstar 7K500 BE, 320GB 0A79103 User Manual
Product codes
0A79103
7K500 OEM Specification
Page 56 of 176
12.6
12.6
12.6
12.6 Advanced Power Management (Adaptive
Advanced Power Management (Adaptive
Advanced Power Management (Adaptive
Advanced Power Management (Adaptive
Battery Life Extender 3) Feature
Battery Life Extender 3) Feature
Battery Life Extender 3) Feature
Battery Life Extender 3) Feature
Battery Life Extender 3) Feature
This feature provides power saving without performance degradation. The Adaptive Battery Life
Extender 3 (ABLE-3) technology intelligently manages transition among power modes within the
device by monitoring access patterns of the host.
Extender 3 (ABLE-3) technology intelligently manages transition among power modes within the
device by monitoring access patterns of the host.
This technology has three idle modes; Performance Idle mode, Active Idle mode, and Low Power Idle
mode.
mode.
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.
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:
A SET FEATURES subcommand to enable Advanced Power Management
A SET FEATURES subcommand to disable Advanced Power Management
A SET FEATURES subcommand to disable Advanced Power Management
The Advanced Power Management feature is independent of the Standby timer setting. If both
Advanced Power Management level 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 it is time to enter the Standby state.
Advanced Power Management level 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 it is time to enter the Standby state.
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.
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.
Management is enabled.
12.6.1
12.6.1
12.6.1
12.6.1
Performance Idle mode
Performance Idle mode
Performance Idle mode
Performance Idle mode
This mode is usually entered immediately after Active mode command processing is complete,
instead of conventional idle mode. In Performance Idle mode, all electronic components remain
powered and full frequency servo remains operational. This provides instantaneous response to the
next command. The duration of this mode is intelligently managed as described below.
instead of conventional idle mode. In Performance Idle mode, all electronic components remain
powered and full frequency servo remains operational. This provides instantaneous response to the
next command. The duration of this mode is intelligently managed as described below.
12.6.2
12.6.2
12.6.2
12.6.2
Active Idle mode
Active Idle mode
Active Idle mode
Active Idle mode
In this mode, power consumption is 45-55% less than that of Performance Idle mode. Additional
electronics are powered off, and the head is parked near the mid-diameter of the disk without
servoing. Recovery time to Active mode is about 20ms.
electronics are powered off, and the head is parked near the mid-diameter of the disk without
servoing. Recovery time to Active mode is about 20ms.
12.6.3
12.6.3
12.6.3
12.6.3
Low Power Idle mode
Low Power Idle mode
Low Power Idle mode
Low Power Idle mode
Power consumption is 60%-65% less than that of Performance Idle mode. The heads are unloaded on
the ramp, however the spindle is still rotated at the full speed. Recovery time to Active mode is about
300ms.
the ramp, however the spindle is still rotated at the full speed. Recovery time to Active mode is about
300ms.
12.6.4
12.6.4
12.6.4
12.6.4
Transition Time
Transition Time
Transition Time
Transition Time
The transition time is dynamically managed by users recent access pattern, instead of fixed times.
The ABLE-3 algorithm monitors the interval between commands instead of the command frequency
of ABLE-2. The algorithm supposes that next command will come with the same command interval
distribution as the previous access pattern. The algorithm calculates the expected average saving
The ABLE-3 algorithm monitors the interval between commands instead of the command frequency
of ABLE-2. The algorithm supposes that next command will come with the same command interval
distribution as the previous access pattern. The algorithm calculates the expected average saving