>I have an NT client that has several drives which need to be backed up
>daily.  One of them is not backing up...

Backup skips some PC disks              Possible causes:
 (skipping)                             - Options file updated to add disk, but
                                          scheduler process not restarted.
                                        - Drive improperly labeled.
                                        - Drive was relabeled since PC reboot or
                                          since ADSM client was started.
                                        - The permissions on the drive are 
wrong.
                                        - Drive attributes differ from those
                                          of drives which *will* backup.
                                        - Give ADSM full control to the root
                                          on each drive (may have been run by
                                          SYSTEM account, lacking root access).
                                        - Msgmode is QUIET instead of VERBOSE,
                                          so you see no messages if nothing goes
                                          wrong.
                                        - ADSM client code may be defective such
                                          that it fails if the disk label is in
                                          mixed case, rather than all upper or
                                          lower.