HGST HCS5C3232SLA380 User Manual
HITACHI CinemaStar 5K 320 Hard Disk Drive specification (Rev 1.21)
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9.13 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 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
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.
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.
9.14 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 to access the 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.5.15.1 Enable/Disable Address Offset Mode
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 to access the 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.5.15.1 Enable/Disable Address Offset Mode
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.
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.
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.
Identify Device command back to the size specified in the last non-volatile Set Max Address command.