iMac (Mid 2011) running OS X Yosemite is up to storage capacity - main reason being lots of movies on iTunes. I deleted a load of them (figuring I can re-download them again if need be) but the free disk space has not increased. Why not? Following an internet search for answers I turned off Time Machine (my iMac is connected to a Time Capsule) but this hasn't helped. I'm stuck. Any help much appreciated, thanks.