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- Accessi bl e
( User Ar ea)
- Bef or e Enabl e Addr ess Of f set Mode
A r eser ved ar ea has been cr eat ed usi ng a non- vol at i l e Set Max command.
LBA 0
LBA 0
LBA 0 LBA R LBA M
LBA M
Accessi bl e
( Syst em r eser ved ar ea)
LBA 0
LBA M
LBA M- R
- Af t er Enabl e Addr ess Of f set Mode
Accessi bl e
( User Ar ea)
Non- Accessi bl e
( Syst em r eser ved ar ea)
- Af t er Set Max Addr ess Command usi ng t he Val ue Ret ur ned by Read Max
Addr ess
LBA 0
LBA M
LBA M- R
Accessi bl e
( Syst em r eser ved ar ea)
Any commands whi ch access sect or s acr oss t he LBA M- R ar e abor t ed wi t h
er r or .
Accessi bl e
( User Ar ea)
Figure 13 Device address map before and after Set Feature
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