Hitachi 7K400 Specifications - Page 112
Enable/Disable Address Offset Mode, Identify Device Data, Exceptions in Address Offset Mode
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10.16.1 Enable/Disable Address Offset Mode Set Features subcommand code 09h Enable Address Offset Mode offsets address Cylinder 0, Head 0, Sector 1, 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. Table 73: Enable/Disable Address Offset Mode 10.16.2 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. 10.16.3 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. Read Look Ahead operation is not carried out, even if it is enabled by the Set Feature command. Deskstar 7K400 Hard Disk Drive Specification 98