I have an Acer laptop and under 'Computer' I have 2 drives; ACER (C

and ACERDATA (

).
I only have 5.85GB free of 70.6GB for the ACER (C

drive but 70.2GB free of 70.6GB for the ACERDATA (

) drive.
Whats the difference? And how do I use the memory of the latter drive?
Ive been googling but still puzzled

I need to know because I have so many music files and figured I had to delete some in order to make room for new music... but maybe this ACERDATA (

) thing is my answer LOL.