IBM DBCA-204860 Hard Drive Specifications - Page 93

Identify Device Data, Exceptions in Address Offset Mode

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Before Enable Address Offset Mode A reserved area has been created using a non volatile Set Max command. User Accessible Area Reserved Area LBA 0 LBA R LBA M After Enable Address Offset Mode The former reserved area is now the user accessible area. The former user accessible area is now the reserved area. User Accessible Reserved Area Area (former (former User Accessible Reserved Area) Area) LBA 0 LBA M R LBA M After Set Max Address Command using the Value Returned by Read Max Address User Accessible Area LBA 0 LBA M Figure 55. Device address map before and after Set Feature 10.9.2 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. 10.9.3 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. Read Look Ahead operation does not be carried out, even if it is enabled by Set Feature command. General Operation Descriptions 85

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Before Enable Address Offset Mode
A reserved area has been created using a non volatile Set Max command.
User Accessible Area
Reserved Area
LBA 0
LBA R
LBA M
After Enable Address Offset Mode
The former reserved area is now the user accessible area.
The former user accessible area is now the reserved area.
User Accessible Reserved Area
Area (former
(former User Accessible
Reserved Area)
Area)
LBA 0
LBA M R
LBA M
After Set Max Address Command using the Value Returned by Read Max
Address
User Accessible Area
LBA 0
LBA M
Figure 55. Device address map before and after Set Feature
10.9.2
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.
10.9.3
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.
Read Look Ahead operation does not be carried out, even if it is enabled by Set Feature command.
General Operation Descriptions
85