Been having trouble with both my PC DVD drive and video recorder in getting a good clean start and/or play/record. Put this in today and followed instructions and after just 30-45 seconds, removed the cleaner disc and tried some prerecorded discs that have given me trouble in the past. No problems now!!! everything I tried out started up lickety split and played perfectly. Probably saved me from ordering a new DVD drive for the PC. Should have had one of these discs months or years ago. Highly recommended.