Nah definitely not the burner. I've used my internal and a USB external and this 100 pack of disks haven't had much luck. I've used my work computer with its internal and even my MacBook. My old batch of TY still works great, no coasters at all.Sounds like a bad burner to me. Or you you got some disks that were damaged by heat exposure.
FYI: "Memorex" and "Verbatim" don't make their own media and can change manufacturers over time.I stopped buying shit media like Memorex a few years ago. Tired of every few disc being bad. I buy 50-100 count Verbatim disc from Newegg now.
Taiyo Yuden and some JVC (JVC media is mostly Taiyo Yuden)I haven't looked into this for a while but Taiyo was the best or JVC. I bought some Verbatims from Best Buy and almost half of the disks were bad. Is there any one brand that you guys would recommend?