HITACHI Deskstar & CinemaStar 7K1000.B & Deskstar E7K1000 Hard Disk Drive specification
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9.14.1
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.
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.
Non- Ac c es s i bl e
( Us er Ar ea)
- Bef or e Enabl e Addr es s Of f s et Mode
A r es er v ed ar ea has been c r eat ed us i ng a non- v ol at i l e Set Max c ommand.
LBA 0
LBA 0
LBA 0
LBA R
LBA M
LBA M
Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
LBA 0
LBA M
LBA M- R
- Af t er Enabl e Addr es s Of f s et Mode
Ac c es s i bl e
( Us er Ar ea)
Non- Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
- Af t er Set Max Addr es s Command us i ng t he Val ue Ret ur ned by Read Max
Addr es s
LBA 0
LBA M
LBA M- R
Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
Any c ommands whi c h ac c es s s ec t or s ac r os s t he LBA M- R ar e abor t ed wi t h
er r or .
Ac c es s i bl e
( Us er Ar ea)
Figure 13 Device address map before and after Set Feature