Sorry, but these discs are really quite awful. It isn't your drive - it is the discs that are at fault. Have a look at this link - it is full of people complaining about these discs :
A few words of advice : unless you have a drive/DVD player that absolutely only accepts DVD-R DL discs, don't use them at all. DVD-R DL discs don't work at all with a lot of DVD players because it is a newer standard than DVD+R DL (no, it's not the same deal as with DVD-R discs). There isn't any other reason to use DVD-R DL discs at all. They offer nothing over DVD+R DL discs.
Also, the most compatible DL discs are made by Verbatim. Most of the other brands (especially the cheaper ones) are all made by Ritek. Many DVD writers and DVD players have problems with Ritek DL media. If you want to avoid the aggravation of playing the "will it work with my equipment?" lucky dip, just stick with Verbatims.