So I was fiddling around with partitions and had no idea how destructive doing that on a Mac is. My rMBP now is basically a Windows machine. The Mac partition still exists and I can browse it in Windows, but it doesn't show up on the boot menu. Is there a sort of "startup repair" for OS X?
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Mac partition won't show up, boot
- Thread starter psykick5
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Try doing a command-r (both keys at once) at startup and that will take you to a recovery partition. From there you can run Disk Utility to reformat the drive or fix the partitions and reinstall the OS if needed. Hopefully you have a Time Machine backup you can use to restore your data after this.
Here is some info on how recovery works.
Here is some info on how recovery works.