IBM IC35L020 Hard Drive Specifications - Page 108

Identify Device Data, 17.3 Exceptions in Address Offset Mode, Before Enable Address Offset Mode

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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 nonvolatile Set Max Address command. Before Enable Address Offset Mode A reserved area has been created using a non-volatile Set Max command. Accessible (User Area) Non-Accessible (Sytem reserved area) LBA 0 LBA R LBA M After Enable Address Offset Mode Accessible (System reserved area) Non-Accessible (User area) LBA 0 LBA M-R LBA M After Set Max Address Command using the Value Returned by Read Max Address Any commands which access sectors across the LBA M-R are aborted with error. Accessible (System reserved area) Accessible (User area) LBA 0 LBA M-R LBA M Figure 75. Device address map before and after Set Feature 13.17.2 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. 13.17.3 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 an Set Max Address command. The Read Look Ahead operation is not carried out even when enabled by Set Feature command. Deskstar 60 GXP Hard disk drive specification 94

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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 nonvolatile Set Max Address command.
Before Enable Address Offset Mode
A reserved area has been created using a non-volatile Set Max command.
Non-Accessible
(Sytem reserved
area)
Accessible
(User Area)
LBA 0
LBA R
LBA M
After Enable Address Offset Mode
Non-Accessible
(User area)
Accessible
(System reserved
area)
LBA 0
LBA M–R
LBA M
After Set Max Address Command using the Value Returned by Read Max Address
Any commands which access sectors across the LBA M–R are aborted with error.
Accessible
(User area)
Accessible
(System reserved
area)
LBA 0
LBA M–R
LBA M
Figure 75. Device address map before and after Set Feature
13.17.2 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.
13.17.3 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 an Set Max Address command.
The Read Look Ahead operation is not carried out even when enabled by Set Feature command.
Deskstar
60 GXP Hard disk drive specification
94