Check the quality of the DVD you burning on. DVDs have corresponding ID code that will tell you where it was manufactured. There are DVDs that are meant to to keep garbage dumps rising so be careful of the brand you choose.
Surprisingly the best brand I ever got was a made in Japan blank disk with no name. Got it from a wholesale/retail outlet in UK. Cheap too (relative), about £15 for 100.
A hint, don't store your unburned disks in sunlight or direct daylight for to long. It increases the risk for CD/DVD-rotting. Creating nasty blue-spots on the disks that make sectors useless. (Something in the UV that doesn't agree with silver on plastic.)
I will try to keep a pack in the fridge, if sealed properly to prevent humidity to get to it, but it's cold, secure, dark and can keep longer.
Another good tip for any "horder" (frantic collectors of everything under the sun)...
Burn the data files as data split with winrar and creating PAR2 files for the disk before burning it all to DVD. Then even if one of the split rar's is corrupt due to CRC errors, you can still recover the original and burn it again without needing to keep dual backups.
Out of thousands of dvd's burned over many years (not all this fine stuff of course), I've not had more than 10's that failed in total. I was lucky I guess.
The ones that did fail where almost all TDK, Verbatim or Fuji disks though.
Gemeines >> ... 2 years for WD drives... thats way short.
Seagate offers lifetime replacement on some, if not most, drives.
My 250 GB WD drive is turning 7 years old now, and it's still spinning circles around my other disks, with the exception of my 250 GB Seagate barracuda.