HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
81
8.13
Automatic Acoustic Management feature set (AAM)
This feature set allows the host to select an acoustic management level. The acoustic management level
ranges the setting of 80h to FEh. Device performance and acoustic emanation may increase with increasing
acoustic management levels. The acoustic management levels contain discrete bands, described in the
section of the Set Feature command in detail.
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
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.
8.14
Address Offset Feature
Computer systems perform initial code loading (booting) by reading from a predefined address on a disk
drive. To allow an alternate bootable operating system to exist in a system reserved area on a disk 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 disk drive address space remains addressable in offset mode. 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, but any
commands 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.
Set Features subcommand code 09h Enable Address Offset Mode offsets address Cylinder 0, Head 0,
Sector 1, and LBA 0, to the start of the non-volatile 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 command 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 non-volatile 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.
Disable Address Offset Feature removes the address offset and sets the size of the drive reported by the
Identify Device command back to the size specified in the last non-volatile Set Max Address command.
Содержание 3.5-INCH Deskstar HDP725050GLAT80
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