I downloaded Transmission and turned out I didn't want it. Since I'm new to Macs I decided to just erase my HD, and reinstall OS X Lion back to factory setting. Well when I erased my Macintosh HD disc storage it ended up deleting it, and giving me another HD named Untitled. Then I went to install a new OS X. Did I do something wrong? or anything harmful to my MBA? Also when I did all of this I noticed my storage space was at 120.99GB. Shouldn't it be roughly near 128GB?