Hitachi HTS725050A9A364 Datasheet download pdf (Page 56)

7K500 OEM Specification

Page 56 of 176

12.6

12.612.6

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

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

12.6.112.6.1

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.

12.6.2

12.6.212.6.2

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.

12.6.3

12.6.312.6.3

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.

12.6.4

12.6.412.6.4

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

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 175 176

Comments to this Manuals

No comments

Hitachi HTS725050A9A364 Datasheet Page 56

Comments to this Manuals

Related products and manuals for Internal hard drives Hitachi HTS725050A9A364