Start up disc

I  was having problems with my pc.  Therefore I tried to erase my disc,  whilst doing so I got a warning stating that my start up disc is running out of space, it suggested that I delete some items to help solve the problem.  I do not have a clue how to free up space on the start up disc. Anyone any idea how to do it.           Maverick OS  & Safari 7

Erasing your disk will free up all the space, if that's what you want to do.
Boot up cmd-r and select Disk Utility. Choose your Mac HD, go to the Erase tab and click on erase.
You do have a good bootable backup?
Alternatively if you don't have another startup disk with a system. Move some of your own files off your hard drive to some other media.

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