Can't Boot Mac OS X After Attempting to Shrink W8 Partition

[patrickgmaris]

Well...

I royally messed up on this one. I needed some extra space on my Mac HD so I booted into W8 and shrank the volume. Then I tried booting into OS X and when holding option at start-up the only drive found is bootcamp. I went back into W8 and extended the volume to the previous size. I realize why this happened, but I'm not sure how to restore my changes. I should have used a proper application rather than try to do it manually.

Anyways, after scouring the internet for a solution for 3 hours, I only found solutions to other problem which is usually where the user cannot boot into BootCamp.

I ran the following commands after booting into Internet Recovery

fdisk /dev/disk0
Disk: /dev/disk0    geometry: 60821/255/63 [977105060 sectors]
Signature: 0xAA55
         Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
1: EE 1023 254  63 - 1023 254  63 [         1 -  977105059] <Unknown ID>
2: 00    0   0   0 -    0   0   0 [         0 -          0] unused 
3: 00    0   0   0 -    0   0   0 [         0 -          0] unused 
4: 00    0   0   0 -    0   0   0 [         0 -          0] unused

gpt -r -vv show disk0
gpt show: disk0: mediasize=500277790720; sectorsize=512; blocks=977105060
gpt show: disk0: PMBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 977105059
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6   
         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640  779296896      2  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  779706536    1269536      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  780976072         56   
  780976128  196126720      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  977102848       2179   
  977105027         32         Sec GPT table
  977105059          1         Sec GPT header

EDIT:

When I try Repair Disk on the whole drive while booted into recover I get this error: "Partition map repair failed file system check while creating loader space for a data partition. You should repair that specific partition and then try repairing the partition map again."

Verify Disk alerts, "The partition map needs to be repaired because there's a problem with the EFI system partition's file system.

Attempting to Repair or Verify Disk on disk0s2,3,or 4 results in "Invalid BS_jmpBoot in boot block: 000000."

EDIT2:

After leaving internet recovery - I can't boot into either OS X or Windows 8.

ANY help will be greatly appreciated.

Worse comes to worst... I can wait till I get home and do a time machine backup after wiping the HD clean and start over. I have been traveling for a few weeks, made a backup before I left, and now i'm at home in Germany. Haven't done too much since then - just transferred over some photos and did some edits which I should be able to copy off from W8 before doing anything.

 

[Altemose]

To my knowledge, you should only ever resize partitions on a Mac using Disk Utility under OS X. I am not sure however if it can resize a Windows partition. Resizing a partition within Windows likely destroyed the necessary boot information for OS X and likely will require a reinstall. Perhaps others can chime in before you try such a daunting task.

 

[yjchua95]

You can't resize a Boot Camp partition.

The only thing you can do is to use WinClone to make an image of your Boot Camp partition, remove Boot Camp and restore it to a single partition, and create a new larger partition using Boot Camp assistant. Then, use WinClone to restore the backup image back to the new larger partition.

 

[patrickgmaris]

Thanks for answers Altemose and jychua95, the damage was already done.

Not much on the Boot Camp partition so I'm not worried about losing it.

I just want to be able to boot back in OS X. Any knowledge?

Will deleting the windows partition do anything substantial? I know the correct procedures for resizing boot camped partitions now.

 

[yjchua95]

Thanks for answers Altemose and jychua95, the damage was already done.

Not much on the Boot Camp partition so I'm not worried about losing it.

I just want to be able to boot back in OS X. Any knowledge?

Will deleting the windows partition do anything substantial? I know the correct procedures for resizing boot camped partitions now.

Boot into Recovery and reinstall OS X.

 

[patrickgmaris]

Boot into Recovery and reinstall OS X.

Thats the easy way out. Like I said in my post. Going to get a some cable and adaptors so that I can put my mbp into TDM and see if I can do anything. Need a few files from the recent trip before I can wipe it clean.

 

[Altemose]

Thats the easy way out. Like I said in my post. Going to get a some cable and adaptors so that I can put my mbp into TDM and see if I can do anything. Need a few files from the recent trip before I can wipe it clean.

Reinstalling OS X keeps data in place and simply replaces the system files. You should try and backup any files before attempting though...