Well, a few months ago I had my main HDD go fritz on me: the freezer trick worked, and it has been working pretty normal ever since; or at least to my knowledge it has, as this computer is kinda funky anyway.
Whatever case, I checked HD Tune today to check the stats on my new 1.5 TB External HDD (for backups no less ^_^) and I discoverd a nice big red flag on my main drive:
RAW READ ERROR RATE: Failed
This is one of the major flags, meaning this drive could die at pretty much any mom