When first starting out in DVD burning, it is always a good idea to buy smaller quantities of blank DVD media
until you are sure your burner likes them.
That will save you money in the long run.
I believe most people starting out have experienced a certain make of blank DVD that just would not perform as expected.
I will say that what I like, and have had no problem with personally, are... see below
8x Ritek GO5
8x Taiyo Yuden
8x MCC 003
8x CMC Magnetics EO1
8x CMC Magnetics AE1
8x Prodisc (Doesn't work for me reliably. Although some others have no problem with them).
So, take phil_'s advice and DL the DVD identifier.
P.S. I burn @ 4x