Q: Help! Windows has damaged Macintosh HD

Hi folks,

I really need some expertise on this one!

I had OS X El Capitan and Windows 10 (bootcamp) installed on my MacBook Pro.

Today i tried to boot Windows, and a screen appeared saying it couldn't boot, so i used windows 10 installation disk to "Fix Startup Problems". After it supposedly fix the issues. I can't boot either on OS X or Windows.

When i boot and press "Alt" only shows OS X, but when i select it, the screen goes black and nothing happens, not even Apple logo (tried to boot on Safe Mode, reset PRAM, and nothing fixed that).

I booted with a OS X install USB and opened Disk Utility, and now instead of two partitions with Macintosh HD and BOOTCAMP it only shows "Untitled".

Here are a few screenshots from Disk Utility and Terminal log:

MacBook Pro, Mac OS X (10.5.4)

Posted on Mar 22, 2016 9:17 AM

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Q: Help! Windows has damaged Macintosh HD

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by Vinny0,

Vinny0 Mar 22, 2016 12:56 PM in response to filipeguerra
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Mar 22, 2016 12:56 PM in response to filipeguerra

Try reinstalling your OS by going to disk utility and erasing "Untitled" and then installing an OS back on it from the front page of the recovery/install disk.
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by Loner T,Helpful

Loner T Mar 22, 2016 4:01 PM in response to filipeguerra
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Mar 22, 2016 4:01 PM in response to filipeguerra

Your disk was converted from a GPT disk to a MBR disk. This is why OSX will not boot. You need to boot from an external disk OSX installation and install GPT Fdisk so your GPT can be corrected.
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by filipeguerra,

filipeguerra Mar 22, 2016 4:02 PM in response to Loner T
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Mar 22, 2016 4:02 PM in response to Loner T

Can that be done without loosing all my data? Or is it already gone?
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by Loner T,

Loner T Mar 22, 2016 5:55 PM in response to filipeguerra
Level 7 (23,828 points)

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Mar 22, 2016 5:55 PM in response to filipeguerra

The 471.9MB disk0s1 worries me. It looks like a Windows RE partition. The 205GB partition is your OS X partition, but till the GPT is corrected, there is no way to evaluate what the damage is. Please install OS X on an external disk - How to install OS X on an external drive connected to your Mac - Apple Support and instal GPT Fdisk on this external disk - https://sourceforge.net/projects/gptfdisk/ .
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Q: Help! Windows has damaged Macintosh HD

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by Vinny0,

by Loner T,★Helpful

by filipeguerra,

by Loner T,

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by Loner T,Helpful