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13.16 Automatic Acoustic Management feature set (AAM)
This feature set allows the host to select an acoustic management level. The acoustic management level
may range from the lowest acoustic emanation setting of 01h to the maximum performance level of FEh.
Device performance and acoustic emanation may increase with increasing acoustic management levels.
The acoustic management levels may contain discrete bands. Automatic Acoustic Management levels
80h and higher do not permit the device to enter Standby mode as a result of the Automatic Acoustic
Management algorithm. The Automatic Acoustic Management feature set uses the following functions:
1.
A SET FEATURES subcommand to enable Automatic Acoustic Management
2.
A SET FEATURES subcommand to disable Automatic Acoustic Management
Advanced Power Management, Automatic Acoustic Management, and the Standby timer setting are
independent functions. The device shall enter Standby mode if any of the following are true:
1.
The Standby timer has been set and times out.
2.
Automatic Power Management is enabled and the associated algorithm indicates that the Standby
mode should be entered to save power.
3.
Automatic Acoustic Management is enabled and the associated algorithm indicates that the
Standby mode be entered to reduce acoustical emanations.
The IDENTIFY DEVICE response word 83, bit 9 indicates that Automatic Acoustic Management feature
is supported if set. Word 86, bit 9 indicates that Automatic Acoustic Management is enabled if set.
Word 94, bits 7–0 contain the current Automatic Acoustic Management level if Automatic Acoustic
Management is enabled, and bits 8–15 contain the Vendor's recommended AAM level.
13.17 Address Offset Feature
Computer systems perform initial code loading (booting) by reading from a predefined address on a drive.
To allow an alternate bootable operating system to exist in a system reserved area on a drive, this
feature provides a Set Features function to temporarily offset the drive address space. The offset
address space wraps around so that the entire drive address space remains addressable in offset mode.
The Max LBA in offset mode is set to the end of the system reserved area to protect the data in the user
area when operating in offset mode. The Max LBA can be changed by an Set Max Address command to
access the user area. If the native MAX LBA is set, the whole user area can be accessed. But any com-
mands which access sectors across the original native maximum LBA are rejected with error, even if this
protection is removed by an Set Max Address command.
13.17.1 Enable/Disable Address Offset Mode
The Set Features subcommand code 09h Enable Address Offset Mode offsets address Cylinder 0,
Head 0, Sector 1, LBA 0, to the start of the nonvolatile protected area established using the Set Max
Address command. The offset condition is cleared by Subcommand 89h Disable Address Offset Mode,
Hardware reset, or Power on Reset. If Reverting to Power on Defaults has been enabled by Set Features
command, it is cleared by Soft reset as well. Upon entering offset mode the capacity of the drive returned
in the Identify Device data is the size of the former protected area. A subsequent Set Max Address com-
mand with the address returned by Read Max Address command allows access to the entire drive.
Addresses wrap so the entire drive remains addressable.
If a nonvolatile protected area has not been established before the device receives a Set Features
Enable Address Offset Mode command, the command fails with Abort error status.
Deskstar 60 GXP Hard disk drive specification
93
Содержание IC35L020 - Deskstar 20 GB Hard Drive
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