Large File still taking storage after Deleted I downloaded a file that is more than 20GB, but after deleting the file the space is still taken, and it's not showing in the finder. I'm using a macbook pro with retina display 121GB with bootcamp and OS X Mavericks.
If you have enabled Time Machine, the disk space could be taken up by local snapshots. When local snapshots are enabled, Time Machine saves snapshots to /.MobileBackups/ when there is more than 10% free disk space. See http://support.apple.com/kb/HT4878. Local snapshots are not counted as used disk space in Finder, but they are shown under backups in the About This Mac window. The snapshots are deleted automatically if disk space is low enough, but since 10.9 the newest snapshot is kept even if there is less than 10% free disk space.

To see what files take up disk space, you can use OmniDiskSweeper:



To include folders like /.MobileBackups/, open OmniDiskSweeper as root by running sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper.

You can also just use Finder. Run sudo defaults write com.apple.finder AppleShowAllFiles -bool true;sudo /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder, open the root folder in list view, and enable calculating all sizes: