IBM DTCA-24090 Hard Drive Specifications - Page 82

Adaptive Battery Life Extender ABLE-2 Feature

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10.5 Adaptive Battery Life Extender (ABLE-2) Feature This feature provides power saving without performance degradation. The ABLE-2 technology intelligently manages transition among power modes within the device by monitoring access patterns of the host. This feature has three idle modes; Performance Idle mode, Active Idle mode, and Low Power Idle mode. This feature allows the host to select a power management level. The 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 power management levels. Device power consumption may increase with increasing power management levels. The 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 ABLE-2 is independent of the Standby timer setting. If both ABLE-2 and the Standby timer are set, the device will goto 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 is supported if set. Word 86, bit 3 indicates that Advanced Power Management is enabled if set. Word 96, bits 7-0 contain the current Advanced Power Management level if Advanced Power Management is enabled. 10.5.1 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. 10.5.2 Active Idle mode In this mode, power consumption is 35-50% 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 40ms. 10.5.3 Low Power Idle mode Power consumption is 55%-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. 10.5.4 Transition Time The transition time is dynamically managed by users recent access pattern, instead of fixed times. The algorithm monitors the frequency of commands over intervals of interest, usually several seconds. The algorithm judges how long the current burst of commands will continue by maintaining a distribution of command frequencies. After each command, the algorithm calculates the probability that the current burst of commands is complete based on the statistics of the distribution. 74 OEM Specifications of DTCA-2xxxx 2.5 inch H D D

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10.5 Adaptive Battery Life Extender (ABLE-2) Feature
This feature provides power saving without performance degradation.
The ABLE-2 technology intelligently
manages transition among power modes within the device by monitoring access patterns of the host.
This feature has three idle modes; Performance Idle mode, Active Idle mode, and Low Power Idle mode.
This feature allows the host to select a power management level.
The power management level is a scale
from the lowest power consumption setting of 01h to the maximum performance level of FEh.
Device per-
formance may increase with increasing power management levels.
Device power consumption may increase
with increasing power management levels.
The 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 ABLE-2 is independent of the Standby timer setting.
If both ABLE-2 and the Standby timer are set,
the device will goto the Standby state when the timer times out or the device's Advanced Power Manage-
ment algorithm indicates that it is time to enter the Standby state.
The IDENTIFY DEVICE response word 83, bit 3 indicates that Advanced Power Management is sup-
ported if set.
Word 86, bit 3 indicates that Advanced Power Management is enabled if set.
Word 96, bits
7-0 contain the current Advanced Power Management level if Advanced Power Management is enabled.
10.5.1
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 fre-
quency servo remains operational. This provides instantaneous response to the next command.
The dura-
tion of this mode is intelligently managed as described below.
10.5.2
Active Idle mode
In this mode, power consumption is 35-50% less than that of Performance Idle mode.
Additional elec-
tronics are powered off, and
the head is parked
near
the
mid-diameter
of
the
disk
without
servoing.
Recovery time to Active mode is about 40ms.
10.5.3
Low Power Idle mode
Power consumption is 55%-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.
10.5.4
Transition Time
The transition time is dynamically managed by users recent access pattern, instead of fixed times. The algo-
rithm monitors the frequency of commands over intervals of interest, usually several seconds. The algorithm
judges how long the current burst of commands will continue by maintaining a distribution of command
frequencies. After each command, the algorithm calculates the probability that the current burst of com-
mands is complete based on the statistics of the distribution.
74
OEM Specifications of DTCA-2xxxx 2.5 inch HDD