i would use the hdd maker software to test those ones since you wrote they are old ones they could be on there way out .
By 'those ones' you mean D:/ and E:/, right? Really? From what I saw with the HD Tune test and just general observation, they seem fine, while all my suspicions and the issues I'm having point towards it being C:/ having trouble. Like, the test results I got for C:/ seem like they're pretty weird and Not Great, unless I'm just completely misreading them. Am I really looking in the wrong direction?