Hi! I've upgraded my iMac with an SSD, now I have 1 SSD and 1 HDD. So, I've installed the mac OS on the SSD, and now I don't need the system (files) on the old HDD, on which are my stuffs, like movies, pictures etc. I want to remove all system files which are on my old HDD. How should I do it? Just delete manually everything together with the hidden files also?