How do I find out...

[dapa]

Dont realy know much about your writer but this may help you say you are trying to find out if your drive will overburn well this is simple if you are using clone cd as you say simply try to burn 700 mb to a 650mb cdrwand clone cd will tell you there is not enough space and gives you the option to try to overburn try it what have you got to loose its a cdrw so you wont even make a caoster
god luck hope this helps