Figure 32 Device Address Map Before And After Set Feature - Hitachi CinemaStar P7K500 Specifications

8.14.1 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.
- Bef or e Enabl e Addr es s Of f s et M ode
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 M ax c om m and.
Ac c es s i bl e
( Us er Ar ea)
LBA 0
- Af t er Enabl e Addr es s Of f s et M ode
- Af t er Set M ax Addr es s Com m and us i ng t he Val ue Ret ur ned by Read M ax
Addr es s
Any c om m ands 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 .

Figure 32 Device address map before and after Set Feature

8.14.2 Identify Device Data
Identify Device data word 83 bit 7 indicates the device supports the Address Offset Feature.
Identify Device data word 86 bit 7 indicates the device is in Address Offset mode.
8.14.3 Exceptions in Address Offset Mode
Any commands which access sectors across the original native maximum LBA are rejected with error, even
if the access protection is removed by a Set Max Address command. If the sectors for Read Look Ahead
operation include the original native maximum LBA, Read Look Ahead operation is not carried out even if it
is enabled by Set Feature command.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
Non- Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
LBA R
Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
LBA M - R
LBA 0
Ac c es s i bl e
( Sy s t em r es er v ed ar ea)
LBA 0
82
LBA M
Non- Ac c es s i bl e
( Us er Ar ea)
Ac c es s i bl e
( Us er Ar ea)
LBA M - R
LBA M
LBA M