How to write on my Macintosh hard drive? (Erase the free space in my drive)

After upgrading my mac to OS X El Capitan, my disk utility have an option of free space clear, but can not click on it. But I know that the OS X Yosemite has.

What should I do? Or do your have an idea to erase safely free space?

Erase free space has been removed from the utility El Capitan of disc.

It can always be done in a Terminal using diskutil (but be careful, it's not properly, you can erase you HD, first backup so)

Tags: Mac OS & System Software

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