My Air's internal HD became unrepairable by both Disk Utility and Disk Warrior, and Disk Warrior reported "speed inhibited by disk malfunction"--which I'm told is a VERY BAD sign. But I just wiped and reformatted the drive and that went OK. Should I trust Disk Warrior and throw out the drive? (Repair hassle!) Or am I pretty safe, as long as my backed-up data copies back onto the drive without error? I've been looking for a (free) way to do some kind of surface scan but haven't found anything. (SMART status is OK, but from my research that doesn't prove much.) Thanks for any advice!