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PC-Doctor
Starting the Diagnostics Program
Navigating Through the Diagnostics Program
Diagnostic Error (XXX-XXX-XXX) Codes
Known - PC Doctor - BUGs
See > PC Doctor diagnostics skips/hangs testing with TAPE drive
False DIAGNOSTIC ERROR with FIXED DISK CONTROLLER test
The following FALSE error message may appear when running the
IBM Enhanced Diagnostics (PC-Doctor) Fixed Disk Controller
Test:
"Disk 0 Controller ......................
Controller data loopback failed, Wrote FFFFH, Read 00H."
PROBLEM ISOLATION AIDS:
- The system is a Netfinity 3500 (8644) or Intellistation (6898)
- The hard disk drive does not contain any data (ie. it is a new
"blank" drive, it was just replaced, or it was just formatted)
- The diagnostic version is 1.8.335 or below
NOTE: The diagnostic version can be viewed by pressing <F10>
on the main menu screen of the "IBM Diagnostics".
Do not replace any hardware as this is a false error message.
The false error message appears if the hard drive being tested
does not contain any data or was just formatted.
The PC-Doctor HD Controller test reads the first sector on the
drive (boot sector) and analyzes its contents to make sure that
there are no stuck-high or stuck-low data lines.
If the hard drive has been partitioned, the first sector will
contain boot and partition table data which can be read and
allow the data lines to be tested.
The false error occurs on "blank" drives because the data
appears to be set to all "zeros" and the loopback test fails.
An engineering investigation is currently in progress.
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.