I got a pack of the $10 for 10 CompUSA own-brand DVD-R for use in my NEC 1300A: I know they're probably crap but thought I'd give them a go, and besides which the sales guy swore up-and-down they would work OK.
Now here's the weird thing, the first box worked great: 10 out of 10, no coasters. The second box ALL failed after about 20-30% written, all in exactly the same spot, no matter what files or software I used. Nero reported 'Illegal Medium Error'. I took them back and got a replacement box, and these look like they're all bad too. +R discs still burn great, even the same files I'd tried on -R.
Has anyone else experienced this? I would have expected a bad batch to fail at different times/locations. I'm beginning to wonder if the -R 'bit' of the drive has failed.