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I recently used bootcamp to dual boot windows on my macbook pro (mid 2014). When I tried to boot back into windows by holding alt at startup, the option to boot windows was gone. Since then I have deleted the windows bootcamp partion with cmd + alt + r at startup (erased it) and made a new os x where in the space bootcamp occupies. Under Disk Utility there is no macintosh internal disk and i’m unsure where to go from here. All help would be greatly appreciated.
Using BootCamp is not a true dual boot. You are running a special session within MacOS so when you deleted BootCamp you deleted the space Windows was running from. Sadly, we can’t recover your Windows storage space BootCamp used. You’ll need to re-install it. If you really want a true dual boot setup you’ll need to first copy off the Windows MacBook Pro drivers from within BootCamp or get them from Microsoft (depending on the Windows version). Then you’ll need to redo your hard drive’s setup into two discreet partitions one for MacOS and the other for Windows. Given the size of your internal SSD drive, you might want to first get a larger SSD 2 TB. That way you have enough space to run both independently. Otherwise, you may want to go back with the BootCamp or use VMware configuration. Install Windows on your Mac with Boot CampHow to Run Windows 10 Natively on Mac: The Good, Bad, and UglyHow to get Windows on Mac