Hey everybody!
I tried to install window on my mac a long time ago and I messed up in the process. Now I have this "untitled" volume that's taking 100gb of space and I can't use it. I tried to use bootcamp to fix it (like someone suggested on the apple forums) but i dont know how to do it!
Please help!
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Put it into Target mode using another Mac. Use Disk Utility (preferably from 10.10.5 or earlier), and erase the drive. Then boot it up holding down the option key, (have a internet connection available). Do a net install after reformatting the drive. This will take it back to the original system. If you have a Time Machine backup, you can restore or just use Migration Assistant.
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If you used Bootcamp to install windows, Bootcamp will walk you through the whole thing. Go through the process like you're installing windows, but instead of adding a partition, there is an option to remove a partition. It will work non-destructively so your data will be safe.
by Steven Oleksiak