I've got a CS 1000 PBX and recently I noticed an error showing up when I overlay passthru to the PBX. The error states that the nightly backup did not complete. I ran LD 143 / abko and it replied that it could not format the floppy. Do I need to replace the floppy disk with a 1.44mb floppy or is there a special floppy disk that will work?