I bought a triple DVD set of a Puccini opera. When inserted into my Mac mini, each disk freezes when I try to play it, and I cannot even eject the DVD until I have forced DVD Player to quit. Could all three disks be defective?

Most of the computer-like devices that you use now store their data on solid-state disk (SSD) rather than traditional hard disk (HD) components. Are they also the best way ahead for regular computers?