The Trash icon in your Dock is not the only trash you need to empty. Here are some things you can do to free up disk space. Some simple hard-drive cleaning measures can reclaim lost disk space and get rid of applications and data files that you no longer use or want. However, no matter how big your drive, you'll be amazed at how quickly application installs, browser caches, and temporary files can eat up your free space and clutter your system. Nowadays, hard drives feature amounts of space. Mac OS X Lion version 10.7 is the eighth and current major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers. How to free up hdd space on Mac OS X 10.7 Lion?