Ever since 10.3.4 update my HD space was dropping. Before I did the update the HD was at 30.5 GB free space. After the update it went down to 29.85 GB. Then the next day it went to 28.85 GB. Now it is at 26.85 GB. I did disk repair permissions. I didn't do any downloading after that. Will the Hardware test pick anything up? Please help.