Recently I've been running the 7beta and last night decided to switch back to vista for more functionality. I changed my boot order to CD/DVD first, HDD second, created a new RAID 0 array and then booted. Everytime it came to install the os I just got a strange clicking noise along with the message of 'remove media and then reboot'.... Eventually I inspected the vista disk and discovered a crack radiating out from the inner hole. The crack had split about 1-2mm into the data area of the disk, which i know from past experience. that this effectively renders the disk un-usable. I hadn't forced the disk in any way but it was clear that this split had come about from frequent placements into the case with an obvious click. So guys, please be carefull with those disks.... I guess I need to contact MS to see if they'll replace the disk but am unsure where to contact.. Anyone have any ideas?