There is a "Fail Safe" bit that will force the test to return pass status and continue testing even if the drive fails. When this happens a "FAIL SAFE ON: XXXXX" message will appear that the drive failed for XXXXX error code.
However, if all the below conditions is satisfied this bit will be ignored:
Did not fail Spin Up Motor or Unlatch Actuator Tests
All heads fail sync demod
Any one head's AGC is saturated
Seek tests will not be performed for any head that fails for Sync Demod.