Necro, you still haven't said much about your system itself. What OS?! Windows XP or Vista? You said you cleaned it, ok, if you are sure then a "process" isn't letting go. Hard to advise how to shut down the culprit without knowing even what verson of Windows you run.
As for what type of CD/RW you have, you certainly can tell without taking apart a machine. Assuming Windows XP: RIGHT click on My computer / pull down to Properties / hit the Hardware tab / then Device Manager button. Click the plus sign next to the CD drives and it will give you all the info you need about your drive without taking it apart. Even if it is only a number (as it probably will be if your drive is old). Take that info down exactly as given (dashes and all if included) and google it with quotes. Voila.
Again we googled this - they recommended several options....basically if i want to lose the cd flash i reboot and it goes..otherwise is there permanently....but only if i use the CD drive...and again is ok if open or a disc is in...i HAVE cleaned it...that ain't the problem..