Just checked in DVDInfo Pro and the spool I bought tonight for $42.53 with tax are Prodisc 4X "Grade A" discs. Haven't tried these yet but people in the forum are noting no problems with these and they seem to have better compatability than the Memorex CMC AF1 discs that I bought last week (at least on other burners...mine work just fine). They come in a purple sleeved spool and have the number CD-725 as their part number.