I got a 1 tb hard disk which is partition to 3. I've been using this for 3 years now and they're almost full including the system C:\ so I tried to delete some garbage files from the those backup 2 partitions. Their size is both 400gb. I deleted almost 200gb on each of them but the properties saying i only got 4gb available space. I even check all the files inside of both partitions and they only got 200gb worth of files on each drive..
I already turned on the show hidden files on folder options.
My question is how can i free and use those space that I didnt use? I tried to defrag my drive but it didnt help.