Format your CF Card after you transfer to your comp. I reformat my 32GB CF Card before EVERY SHOW. After every show, I save a copy on my 722's 40GB INHDD, and then reformat my CF Card again. Unless you want weird errors or dropouts, just format the card before every recording
What I'm saying is, DO NOT DELETE and then record. Format, write until card is full, transfer to comp, reformat card to be fresh again, DONE!
Got it? Ive heard MANY weird things happening to tapers that resulted in a loss of a recording, or dropouts, that can be traced back to a CF Card that wasnt formated in a while!