Bootcamp assistant fails to partition

[kiouv]

Hello,

I have a problem with my MBP 2014. I upgraded lastly for Yosemite.

1. I want to install Windows with Bootcamp, but it fails to partition the disk. In Disk Utility, when I verify the Macintosh HD, it says I need to hold Cmd+R at startup to enter recovery mode, and then use Disk Utility.

2. When I do so, I verify and repair the disk, and everything goes fine.

3. When I try again in Normal mode, number 1 keeps happening.

Do you see any solution ?

Thank you

 

[h9826790]

How full your disk?

 

[kiouv]

235 Go free on 500 Go. I want 150Go for Windows.

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I tried with 120 Go for Win, same failure.

 

[Weaselboy]

235 Go free on 500 Go. I want 150Go for Windows.

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I tried with 120 Go for Win, same failure.

The Yosemite install probably turned your disk into a core storage volume that cannot be resized.

Disconnect any external drives then enter the command below in Terminal to revert the core storage then it should work.

diskutil cs revert /