you could try burning at say 8X and see if it helps .Burns failing at the outer edge is common with crap media ,princo were notorious for failed burns over the 4 gig mark .Like its been said Verbs and TYs .The Verbs will have an MCC id these are +R 16x
Physical Format Information (ADIP):
Disc ID: MCC-004-00
Book Type: DVD+R
these are -R 16x Verbs
Pre-recorded Information:
Manufacturer ID: MCC 03RG20
Physical Format Information (Last Recorded):
Disc ID: 0@P-!-00
that disc ID is common to -R media
Taiyo Yuden discs +R
Book Type: DVD-RPhysical Format Information (Last Recorded):
Disc ID: YUDEN000-T02-00
Book Type: DVD+
dont know where you're located but in the US www.meritline.com
you can also check Office Depot ,Staples ,Best Buy I catch the Verbs on sale cheap and buy enough to get me to the next sale