My disk info reader says these Memorex disks are labeled RITEK-D01-01. They are made by Ritek, and digitalfaq lists them as 3rd-class media, with only a 50-80% success rate. Given the number of problems I've had with these disks, I say STAY AWAY. Verbatim DVD+R DL disks are labeled MKM-001-01, made by Mitsubishi-Kagaku Media, and digitalfaq lists them as 1st-class media, the best, with almost no failures. These classifications are in accord with my experience. Get Verbatim from new egg and save money, time, and aggravation. It's too bad that Memorex sullies it's name with such junkie disks.