I can not install os x mountai lion

Hi,
I am trying to instal the new os in my mackbook, but I can not do it. I accept the terms and when I must choose in which hard disc I want to install the os. when I choose my hard disc, the only I have, I do my copies in an external disc, appears a note that told me: this hard disc is the one that I use when I do my copies and I cant not install the hard disc. How I could solve that problem.
Thanks and excuse my english level!!
Mila

Depending on the capacity of the startup disk, make sure there's at least 15% available disk space.
Example:   A 500GB drive would need 75GB free space minimum.
If necessary, you can use Safe Mode to free up space.
Step by Step to fix your Mac: Apple Support Communities

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