I was trying to use bootcamp to install windows 10. After I installed windows, I accidentally did the process again because windows didn't pop up. Now I lost 40gb and I don't know how to get it back. Help?
MacBook Air, iOS 9.0.1
The simplest and safest method to get your disk space back is
1. Backup OSX and all your files - Use Time Machine to back up or restore your Mac - Apple Support .
2. Boot into Internet Recovery (Command+Opt+R) - OS X: About OS X Recovery - Apple Support .
3. Click on Utilties -> Disk Utility and Erase your internal whole disk.
4. Restore OSX and your files - Use Time Machine to back up or restore your Mac - Apple Support .
This requires a separate external disk which can accommodate TM backup - Backup disks you can use with Time Machine - Apple Support .
Lost 40gb to bootcamp. How to get it back?
