So I have had my MBA for about 2 weeks and I am trying to look ahead to the future so I have sone a clean install already, etc... learning time machine, so in the future hopefully I'll know how to handle some issue's. I started to download a large file and stopped it in the middle of the download as I noticed my SSD HD space go from the 80 GB to 13 GB. So I stopped the download and deleted the part that had downloaded but I could never get any of the HD space back. Ended up learning how to do a recovery from Time Machine. What exactly could have happened. How come I didn't get the space back by putting items in the trash and emptying it. I did restarts, shut downs, disk utility, and nothing would get the space back but a restore. Putting this thing through the paces to learn about Mac OS again! Thanks!