Q: Can't boot Windows after resizing OS X partition
First, here is some information about my setup. I use Mac OS X Yosemite 10.10.3 and then I have used Bootcamp to create a partition for Windows 7. This has worked perfectly since I did it a year ago, but now I have a problem.
I wanted to add more space to the Windows partition, but after just resizing my Mac OS X partition to make 20gb of unallocated space, I can no longer boot into Windows - it does not show up as a bootable disk when starting up with Option key held down.
- The Bootcamp partition does show up in Finder, and I can see my files and folders on there.
- It also shows up in Disk Utility, however all buttons for repair etc. are greyed out and it says "Write protected" when I hover over the partition. There is also a line in the bottom saying "Owners Enabled: No".
- Bootcamp also shows in Startup Disk settings, but if I try to boot to it, it says "No bootable device detected".
Here is what I did to resize the partition:
- Boot to Online Recovery Mode
- Go to Disk Utility > Macintosh HD > Partition
- Then I dialed the wheel for Macintosh HD backwards, to free up 20gb of space
- Pressed OK and it started the resize process, which completes without errors
- Restart Mac and then I can no longer boot to Windows
I have downloaded GPT fdisk but I wanted some information first, before using it. Hope someone here can guide me in this.
MacBook Pro, OS X Yosemite (10.10.3)
Posted on Aug 13, 2016 4:16 AM
Can you use Re: [Help] Can't boot to windows (8.1) after resizing partition as a reference and install Gdisk and rebuild the MBR and test?
Posted on Aug 14, 2016 4:13 AM





