I knew something wasn't right. My computer, a 2012 Mac Pro, had suddenly decided to go slow. Not just slow, but slow in a very specific way. It was like it was stopping to think every few seconds. It was something that was eerily familiar. I'd seen this before, and I hoped the cause wasn't the same, but I knew in my heart what was happening. My hard drive was failing. Worse, it was my system drive.