Deleting catalog and starting over.

I don't actually use LR for keeping track of anything.  I use Bridge and physically store all images according to their related subject matter. I used it because Bridge stopped the ability to see thumbnails of and play my video files, so all I have from the camera is a bunch of icons.  In my workflow, after weeding the raw camera files and adding metadata in Bridge, I rename files 1st with my numbering system and later adding the description to the file name before permanently residing the files on their final location which may be a species or family folder (most are nature related) .  So I started with the catalog defaulting on the C drive which has used up a lot of HD space needlessly.  I since read that it is recommended on a drive with more room.  I just want to clarify the location of this before deleting it and starting over.  One possible concern is an email from the "LR Queen" about someone who lost so many photos by doing something or other. This probably doesn't apply since I am not relying on the LR images for anything except to see what is on the videos, and I know where I've put everything but I want to be sure I am clear before taking such an action.  The other thing I am wondering about is that I originally had all my videos on external drive R where I may have started looking at some in LR.  But I got an internal drive H and copied everything there, and that is where I do everything.  But what is strange is that while I am working with those videos and I know I am on the I drive,  I sometime hear the R drive clattering away like a lot of activity and even if I close all windows and try to safely remove it, it says its in use and won't allow.  could that be related?