Just so you know, if you’re looking for good, cheap DVD-Rs, leave Velocity brand off your list. I got a pack of 100 8x for like $30 from Amazon and I thought it was a great deal until I started burning — or trying to burn — with them. At least 1/3, more like 1/2, end up being bad. I have NO problems with the DVD RWs or other DVD Rs I try, so I know it’s not my burner. Bleargh.
Contact the manufacturer. Many times they will replace defective disks. A friend of mine had that happen with a big name brand CD-R and they sent him a new spool that worked fine. Turned out it was a bad batch.