Register Initialization; Figure 58. Default Register Values; Figure 59. Diagnostic Codes - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

11.2 Register initialization

After a power on, a hard reset, or a software reset, the register values are initialized as shown in the table
below.

Figure 58. Default Register Values

If an Execute Device Diagnostic command is carried out, if the system is powered on, or if a hard reset oc-
curs, the system generates an Error Register diagnostic code. See the table below for a description of the
codes.

Figure 59. Diagnostic Codes

Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Alternate Status
Code Description
01h No error detected
02h Formatter device error
03h Sector buffer error
04h ECC circuitry error
05h Controller microprocessor error
8xh Device 1 failed
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Default Value
Diagnostic Code
01h
01h
00h
00h
A0h
50h
50h
75