I recently replaced 2 of my internal 1tb drives with 2tb drives, since then I've been noticing some strange behaviour.
The system randomly 'stutters' for less than a second at a time, it's most noticeable when video is playing as you hear it in the audio. I've observed that during these stutters, if I go to My Computer the Free Space and Total Size values have disappeared, although the drive names remain, and the green progress/path bar is refreshing. As per the below, although I've observed drives C, F and L all go blank at different times.
This has been doing this for a few days whilst I've been trying to fault find and this evening when I tried to turn on the PC I got a MIssing Bootmgr error which I was able to resolve by restoring to a previous system restore point.
I've spent a couple of days googling this but haven't been able to find anybody that seems to have had the same issue, so I'm hoping someone here can point me in the right direction.