Julesau - You’ve posted the same question in 3 threads. How many times does it have to be pointed out that the 167T drive ONLY READS. It doesn’t burn, hence why Liteons tech support DOESN’T suck because they say “this drive only reads and does not come with burning software”.
Take the drive back to the shop you bought it from if you aren’t happy with the product, or if they have told you it writes anything. It doesn’t.
DVDroms don’t return accurate results for scans. You really need a dvdwriter to scan them properly.
You can use the DVDrom for your own use to check the general quality of the DVD’s which you have, but it cannot be compared to other results on cdfreaks as they have been performed with DVD writers.