Register Initialization; Figure 60. Default Register Values; Figure 61. Diagnostic Codes - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

11.1.1 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 60. Default Register Values

As a result of carrying out an Execute Device Diagnostic command or being powered on, or if a hard reset
occurs — the system generates an Error Register diagnostic code. See the table below for a description of
the various codes.

Figure 61. Diagnostic Codes

Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Alternate Status
Code
01h No error detected
02h Formatter device error
03h Sector buffer error
04h ECC circuitry error
05h Controller microprocessor error
8xh Device 1 failed
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Default Value
Diagnostic Code
01h
01h
00h
00h
A0h
50h
50h
Description
79