Reclaim disk space from old Windows partition? How do I reclaim the disk space used by my former Windows partition? 

Clear free space in Disk Utility


  So I recently removed Windows 7 from my iMac, but Bootcamp didn't let me do it. I used Disk Utility instead. The old Windows 7 partition now shows up as free space. I want to reinstall Windows 7 again on my iMac, how do I set it up? Can I use the free space again? I want to give the Windows partition a bigger size than what the free space currently holds.


I'm having the exact same issue, but mine is 70 GB of data on 250 GB flash drive. I too am running OS X 10.10, Yosemite.

The accepted answer to the question above says restore the computer, but I don't want to lose my data or buy a Time Machine drive. What should I do?
I installed the Windows 10 Preview.
I then booted up into OS X.
I turned off FileVault, and removed my Windows partition via Boot Camp Assistant. 


Finally, check disk utility and you'll see the free space went to your Mac partition.