Crash on installation OS X

[Mackgregor]

Ok i retried with the first choice in verbose mode.
Here's what i have on screen :

I have to try to find how to unmount the volumes or erase the disk. I'm pretty sure that's what blocks it ...

 

[Mackgregor]

Please... someone have a solution ?

 

[Mackgregor]

Eh oh..... i'm here, i need help please...
Ask me if you need sup. informations...

 

[Mackgregor]

Nobody have solution ? :/