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I'm using Mac 10.10 (Yosemite) with Bootcamp. On my Windows 8.1, I enabled BitLocker and restart.

Now when I press the Option button during startup, I don't see my Mac OS anymore. There is only Windows and Recovery option.

How do I recover from that ?

  • Bitlocker will have tried to make a new partition on the Mac's boot volume. This is not a good thing. – Tetsujin Dec 12 '15 at 11:33
  • Sadly yes, Bitlocker messed up the Mac partition and I lost the Mac boot option. I'm trying to look for a solution using gdisk sourceforge.net/projects/gptfdisk/ – Dio Phung Dec 12 '15 at 17:54
  • I'm sorry, it's beyond my abilities - I just know it's not a safe option, Windows does not understand the way the Mac fools it into thinking it's on an MBR disk & breaks things badly if allowed to touch the partitioning. – Tetsujin Dec 12 '15 at 19:47

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