On a collague's MacBook Air running 10.11.4, we used Disk Utility to shrink the Mac Partition so that we could then use a Windows tool to expand the BootCamp partition. However, upon reboot, we got a DOS screen with the error that Windows can't boot because it can't find a boot device.
Help, please?
OS X El Capitan (10.11.4)
This is not an Apple-supported mechanism for changing Windows partition size. Apple supports remove/re-install only.
We can try to correct it. Please post the output of the following OSX Terminal commands.
diskutil list
diskutil cs list
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
What is the year/model of the MBA? Please do not post the serial number of your Mac. The "sudo" commands will prompt you for your password.
Thanks for replying. 🙂
The Mac is a MacBook Air (13-inch Mid 2012) running Mac OS 10.11.4.
Here are screenshots of the output of the commands you posted:
Please post the output of
sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C
Can you use Re: [Help] Can't boot to windows (8.1) after resizing partition as reference and recreate your MBR?
If you need to add the 65GB to Windows, please see this link . If you follow this, you will need to recreate the MBR again, using the same steps but using 2 3 4 instead of 345 partition layout.
Thanks! I will try. At this point, all I want to do is recreate the MBR and get back to where I was. Adding the 65 GB to Windows seems too complicated at this point.
I want to make sure I understand your second paragraph. When you say, "If you follow this..." are you referring to the first set of instructions you linked to, or the second? Meaning, do I use 2 3 4 or 3 4 5 if all I want to do is get back to where I was?
First link lets you recreate the MBR, the second link will let you expand BC/Windows to use the 65GB and is also references in the first link.
I am unable to perform Step A (Disable SIP). I get an Apple.com error message.
Should I proceed without doing Step A?
The Step A should be done in Local Recovery, but if Command+R brings up Internet Recovery, then Local Recovery is corrupted. You may have to use How to install OS X on an external drive connected to your Mac - Apple Support and disable SIP using the Local Recovery of this external disk and then try Step B.
I Resized the Mac Partition to make more space for BootCamp and now Windows won't boot
