MacTest 6.0: Wrong Error Number During Test Of External Drive

MacTest 6.0 displays an erroneous error number during the external drive test
when it's run for the first time. You can perform a valid test without
rebooting simply by running the external drive test a second time.

Follow these steps when you want to use MacTest 6.0:

1. Boot MacTest 6.0 on either a 512K or 128K Macintosh. Run all tests by
choosing Start.

2. If all is well, Pass will be highlighted. Choose Select Test, then specify
that only the external drive test be run.

3. Click on Start. MacTest will return a Failed message with the number
50010.0004.

4. Click on Start again. This time the drive test should run properly. If the
external drive is good, the test will indicate "Pass"; if the test returns
a "Failed" message again, the drive is indeed faulty.