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Western Digital Hard Disk Drive OEM Specification
Command data structure: Data format of each command data structure is shown below.
Features register (7:0) (see Note)
Sector count register (7:0)
Sector count register (15:8)
Sector number register (7:0)
Sector number register (15:8)
Cylinder Low register (7:0)
Cylinder Low register (15:8)
Cylinder High register (7:0)
Cylinder High register (15:8)
Timestamp (milliseconds from Power-on)
Note: bits (7:0) refer to the most recently written contents of the register. Bits (15:8) refer to the contents of the
register prior to the most recent write to the register.
Table 149 Command data structure
Error data structure: Data format of error data structure is shown below.
Sector count register (7:0) (see Note)
Sector count register (15:8) (see Note)
Sector number register (7:0)
Sector number register (15:8)
Cylinder Low register (7:0)
Cylinder Low register (15:8)
Cylinder High register (7:0)
Cylinder High register (15:8)
Extended error data (vendor specific)
Note: bits (7:0) refer to the contents if the register is read with bit 7 of the Device Control register cleared to zero. Bits
(15:8) refer to the contents if the register is read with bit 7 of the Device Control register set to one.
Table 150 Error data structure
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