Hitachi 7K320 Specifications - Page 54

Advanced Power Management Adaptive, Battery Life Extender 3 Feature

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12.5.6 Initial Power Mode at Power On 7K320 SATA OEM Specification After power on the device goes to IDLE mode or STANDBY mode depending on the setting of the Power Up in Standby Feature set 12.6 Advanced Power Management (Adaptive 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. This technology has three idle modes; Performance Idle mode, Active Idle mode, and Low Power Idle 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. 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  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. 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. 12.6.1 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. 12.6.2 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. 12.6.3 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. Page 54 of 176

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7K320 SATA OEM Specification
Page 54 of 176
12.5.6
Initial Power Mode at Power On
After power on the device goes to IDLE mode or STANDBY mode depending on the setting of the
Power Up in Standby Feature set
12.6
Advanced Power Management (Adaptive
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.
This technology has three idle modes; Performance Idle mode, Active Idle mode, and Low Power Idle
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.
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
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.
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.
12.6.1
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.
12.6.2
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.
12.6.3
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.