I put a bunch of my wife’s photos on a cd, took them to Walgreen’s and printed out hard copies for her to send to her parents. Turns out one group of photos was omitted, so this morning I put the same cd in my computer, highlighted the missing pictures, and clicked ‘copy to cd’. Well, they copied over fine, but they also ERASED the other pictures that were already there. Fortunately, they are all backed up on my hard disc so nothing has been lost, but is this the way it is supposed to work? I can’t keep adding new material to a CDRW, even if there’s room? I have to erase everything and start over? Thx.