OS X 10.8.6 installed on USB Flash Drive using most of drive space I have created an installation of OS X on a small drive. Everything has worked fine apart from the fact that it has used up most of my space. According the file size on each of the folders in the root directory do not amount to the space shown in the disk utility. 

I have only done an install of OS X and DeployStudio so it surely should not be using up an entire 32 GB drive.

I have tried verifying and repairing the disk as well as a couple of reboots.
As Zigg has mentioned this isnt a great idea for a long term solution. However if you do want to do this for any sort of drive it can be done using Daisy Disk app to remove any sleep image files. However these will be recreated when your machine goes into sleep mode again.