Hitachi C4K60 Specifications - Page 46

If a Protected Area has been created using the SET MAX ADDRESS EXT command, all SET MAX

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If a Protected Area has been created using the SET MAX ADDRESS command, all SET MAX ADDRESS EXT commands result in command aborted until the Protected Area is eliminated by use of the SET MAX ADDRESS command with the address value returned by the READ NATIVE MAX ADDRESS command. If a Protected Area has been created using the SET MAX ADDRESS EXT command, all SET MAX ADDRESS commands result in command aborted until the Protected Area is eliminated by use of the SET MAX ADDRESS EXT command with the address value returned by the READ NATIVE MAX ADDRESS EXT command. The SET MAX SET PASSWORD command allows the host to define the password to be used during the current power-on cycle. The password does not persist over a power cycle but does persist over a hardware or software reset. This password is not related to the password used for the Security Mode Feature set. When the password is set the device is in the Set Max Unlocked mode. The SET MAX LOCK command allows the host to disable the SET MAX commands (except SET MAX UNLOCK) until the next power cycle or the issuance and acceptance of the SET MAX UNLOCK command. When this command is accepted the device is in the Set max locked mode. The SET MAX UNLOCK command changes the device from the Set Max Locked mode to the Set Max Unlocked mode. The SET MAX FREEZE LOCK command allows the host to disable the SET MAX commands (including Set Max Unlock) until the next power cycle. When this command is accepted the device is in the Set Max Frozen mode. 7.2.6. Address Offset Feature (Vendor Specific) Computer systems perform initial code booting by reading from a predefined address on a disk drive. To allow an alternate bootable operating system to exist in a reserved area on disk drive, Address Offset Feature provides a Set Feature 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. The Set Max pointer is set to the end of the reserved area to protect the data in the user area when operating in offset mode. This protection can be removed by a SET MAX ADDRESS / SET MAX ADDRESS EXT command to move the Set Max pointer to the end of the drive. Set Feature Command Subcommand code 09h "ENABLE ADDRESS OFSET MODE sub command" offsets address LBA 0(Cylinder 0, Head 0, Sector 1) to the start of a non-volatile reserved area established using the SET MAX ADDRESS / SET MAX ADDRESS EXT command. The offset condition is cleared by SET FEATURE command Subcommand 89h "DISABLE ADDRESS OFFSET MODE", Software Reset, Hardware Reset or Power on Reset. Upon entering offset mode the capacity of the drive returned in the IDENTIFY DEVICE data is the size of the former reserved area. A subsequent SET MAX ADDRESS / SET MAX ADDRESS EXT command using the address returned by READ MAX ADDRESS / READMAX ADDRESS EXT command allows access to the entire drive. Addresses wrap so the entire drive remains addressable. K6610170 Rev.2 Dec 22, 2004 - 46 -

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K6610170
Rev.2
Dec 22, 2004
- 46 -
If a Protected Area has been created using the SET MAX ADDRESS command, all SET MAX ADDRESS
EXT commands result in command aborted until the Protected Area is eliminated by use of the SET MAX
ADDRESS command with the address value returned by the READ NATIVE MAX ADDRESS command.
If a Protected Area has been created using the SET MAX ADDRESS EXT command, all SET MAX
ADDRESS commands result in command aborted until the Protected Area is eliminated by use of
the SET MAX ADDRESS EXT command with the address value returned by the READ NATIVE MAX
ADDRESS EXT command.
The SET MAX SET PASSWORD command allows the host to define the password to be used during the
current power-on cycle. The password does not persist over a power cycle but does persist over a hardware
or software reset. This password is not related to the password used for the Security Mode Feature set.
When the password is set the device is in the Set Max Unlocked mode. The SET MAX LOCK command
allows the host to disable the SET MAX commands (except SET MAX UNLOCK) until the next power cycle
or the issuance and acceptance of the SET MAX UNLOCK command. When this command is accepted the
device is in the Set max locked mode. The SET MAX UNLOCK command changes the device from the Set
Max Locked mode to the Set Max Unlocked mode.
The SET MAX FREEZE LOCK command allows the
host to disable the SET MAX commands (including Set Max Unlock) until the next power cycle. When this
command is accepted the device is in the Set Max Frozen mode.
7.2.6. Address Offset Feature (Vendor Specific)
Computer systems perform initial code booting by reading from a predefined address on a disk drive.
To allow an alternate bootable operating system to exist in a reserved area on disk drive, Address Offset
Feature provides a Set Feature 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. The
Set Max pointer is set to the end of the reserved area to protect the data in the user area when operating in
offset mode. This protection can be removed by a SET MAX ADDRESS / SET MAX ADDRESS EXT
command to move the Set Max pointer to the end of the drive.
Set Feature Command Subcommand code 09h “ENABLE ADDRESS OFSET MODE sub command” offsets
address LBA 0(Cylinder 0, Head 0, Sector 1) to the start of a non-volatile reserved area established using
the SET MAX ADDRESS / SET MAX ADDRESS EXT command. The offset condition is cleared by SET
FEATURE command Subcommand 89h “DISABLE ADDRESS OFFSET MODE”, Software Reset, Hardware
Reset or Power on Reset. Upon entering offset mode the capacity of the drive returned in the IDENTIFY
DEVICE data is the size of the former reserved area. A subsequent SET MAX ADDRESS / SET MAX
ADDRESS EXT command using the address returned by READ MAX ADDRESS / READMAX ADDRESS
EXT command allows access to the entire drive. Addresses wrap so the entire drive remains addressable.