Hi! I have been using TDK DVD-R disks over the last few years, and recently they stopped working in my Aluminum 20" iMac. I found some random disk from Moserbaer (Indian company) that work fine and my super high end Sony DVD-RW work great. From these forums, I learned about the cheap drives Apple uses. When I insert a TDK, it makes weird noises as if its trying to read it then spits it out after about 15 seconds. Can someone tell me what are the cheapest decent quality discs that will work with my iMac? Thanks in advance!