I have found if you go over 3.5 gigs on these particular discs you get pixelations galore. I have bought them individually and in 25 packs. They are the purple dvd-r discs and are called dvdpro on several websites selling them for around $2.00 each or cheaper if you buy 25 or more. I have had no issues with the unbranded discs with no colors or writing on the disc face but steer clear of the purple dvdpros. I have had this happen with 3 seperate orders. I thought it may be just a problem with one batch but now I think I is the entire line.