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10.1.1 Register Initialization
Table 32 Default Register Values
Register
Default Value
Error
Diagnostic Code
Sector Count
01h
Sector Number
01h
Cylinder Low
00h
Cylinder High
00h
Device/Head
00h
Status
50h
Alternate Status
50h
After power on, hard reset, or software reset, the register values are initialized as shown in Table 32.
Table 33 Diagnostic Codes
Code
Description
01h
No error detected
02h
Formatter device error
03h
Sector buffer error
04h
ECC circuitry error
05h
Controller microprocessor error
The meaning of the Error Register diagnostic codes resulting from power on, hard reset or the Execute Device
Diagnostic command is shown in Table 33.
10.2 Diagnostic and Reset Considerations
In each case of Power on Reset, COMRESET, Soft reset, and EXECUTE DEVICE DIAGNOSTIC command, the
device is diagnosed and the Error register is set as shown in Table 33.
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Hard Disk Drive Specification