Back up your data to online server and access it anywhere from your computer.
4Sync offers more space and just as much style as most of the popular cloud-storage apps. It is a little costly to expand, but it's hard to beat 15GB of storage right out of the box. If nothing else, it's worth having around to keep a few dozen photos or CDs from clogging up your hard drive.
Install Windows/WinPE onto a USB drive and boot from it.
Remove unneeded files and folders and free up disk space.
Manage disk partitions on hard drive and removable media.