Database / Libary management Question

I have parts of my engine dj music collection on different hd. Is it normal that I have an engine library folder on each of those hard drives? I noticed that I have very long loading times inside the engine dj software, especially when it comes to Aggregating drives I am sometimes waiting for more than an hour after starting the software.

Yes, that’s normal

I started my Journey with engine dj with a few smaller hard drives but now have one that fits my whole collection, is there any way to move those parts of my collection that is still on my other smaller HDs over to my main drive without destroying all the work I did with those music files in engine dj? Thanks for help