here is my problem/annoyance. a couple of days ago it recognized blank cd-r's fine. i bought some generic staples cd-r's and it was working fine. after the 6th one, i got a message saying it could not perform an "end of disc" track. after this happened, it just stopped reading blank cd-r's anymore. i tried using brand new memorex cd-r's but they didn't work either. it has no problem reading blank dvd-r's, though. i tried upgrading the firmware but that didn't help at all. what could be wrong? i just bought the drive last october.