Changed bootcamp partition size and now I can't boot into OS X

[ostrykolesz]

Please help. I changed my boot camp partition size and now I cannot boot in to OS X. I can still use Windows 8. I think I erased my EFI partition. I tried using disk utility to repair and verify my EFI partition. I attached a picture of the error message that I received while trying to repair it. Any ideas? Thank-you.

So far I have tried:
- Disk Utility
- Test Disk
- gdisk (can't figure out how to use it in Windows)
- Google

 

[kohlson]

Please help. I changed my boot camp partition size and now I cannot boot in to OS X. I can still use Windows 8. I think I erased my EFI partition. I tried using disk utility to repair and verify my EFI partition. I attached a picture of the error message that I received while trying to repair it. Any ideas? Thank-you.

So far I have tried:
- Disk Utility
- Test Disk
- gdisk (can't figure out how to use it in Windows)
- Google

Not a good prognosis. Most utilities warn to make sure you have a back up for just this reason. Have you lost the boot capability or everything in the partition including files?

 

[ostrykolesz]

Not a good prognosis. Most utilities warn to make sure you have a back up for just this reason. Have you lost the boot capability or everything in the partition including files?

I can still boot in to Windows and I can still mount my OS X partition in Windows.

I am now trying to back-up my photos from my Photos library in Windows onto a HFS partitioned external hard drive. If I use Paragon HFS+ to mount my OS X drive, my Photos library is not visible since it is hidden for some reason. If I use the bootcamp HFS drivers to mount my OS X drive, my Photos library is visible but my OS X partitions are then read only. Any ideas about helping here?

I think I will now try installing Ubuntu. Maybe it will fix my EFI partition.

 

[DeltaMac]

One of the disadvantages of the Boot Camp solution - the two file systems (OS X and Windows) are foreign to each other. If you change the partition size on one, the other system is likely to break. There are work-arounds to make it happen, but the usual method to give more space to Windows, for example, is to use a backup utility for Windows, such as Winclone, to, well, backup the windows partition. Boot to OS X, run Boot Camp to remove the boot camp partition. Then run boot camp AGAIN to create the partition in the size that you need. That will successfully navigate the barriers to resize the OS X partition, so THAT stays bootable, too. Then, use your Winclone backup to restore the Windows software.
This is something that will happen when you use Windows partition software to resize the Windows partition. It doesn't know what to do with the OS X boot partition. In your case, it appears from your screenshot that the OS X partition was changed to a fat32 partition (probably a boot block modification), which is NOT a useful format for an OS X system partition.

 

[ostrykolesz]

I ended up wiping my drive and reinstalling OS X...