My computer has been unusually active recently, and I'm not sure why. I can hear a constant hum as I write this, and Activity Monitor tells me the Finder is consuming 99% CPU. There are only two reasons why this might be. (1) I did a command in Terminal that maxed out my CPU so I could quickly drain the battery (for a battery calibration). But Terminal is closed and I have since turned off my computer. (2) I used PhotoRec to recover deleted files from my external hard drive. I ended up recovering over 100,000 items which (obviously) took up a lot of memory. Right now I have 95 GB free on my (250 GB) hard drive. Again, I'm not sure why this would be hogging the CPU. I'm attaching a screenshot of my Activity Monitor in case that helps. Any ideas?