there's no such thing as "unlocking" a CD. You do however have a few options. You can do whats called an over-burn on a disc, provided that you have a burner that can do it and software that allows you to (nero, for example does.) I'm not sure how much extra space you can get though. Or for an easier route, why not just get 90 minute/800 MB CDRs? Yep, they make them. www.allmediaoutlet.com.