# acis_process_events (CIAO 3.4): The following error occurred 26941 times:
  dsAFEBADPCNTERR -- WARNING: Event island contains 1 or more bad pixels.

This warning indicates that one or more of the nine pixels in a 3x3 event island is identified as a bad pixel. The 26,941 events for which this is the case (in this example) have a STATUS bit set to one. These events can be removed from an event file by using dmcopy with status=0, as shown in the ACIS Data Preparation threads. This message is produced whenever a bad pixel file is used and may be safely ignored.