[Help] Can't boot to windows (8.1) after resizing partition

My Mac is Macbook Pro Retina 13-inc late 2013.

The purpose of creating new partition is I want to have a place to share data between Win and Mac. Now it looks like there is no way to do that, right?

I think this issue is Apple software bug because they design both Bootcamp and DiskUtility but using DiskUtility to create new partition create this kind of trouble for user. My issue is similar to the issue in this thread https://discussions.apple.com/thread/7399957?answerId=29549532022#29549532022 and we both are unable to find out solution.

Your 2013 Mac supports two modes of Windows 8.1/10 installation. In your specific case, if you upgraded from W7, the original installation was MBR/BIOS. Your Mac also defaults to a MBR/BOS installation of W8.1. DU warns you that Windows will not work, if you create an additional partition.

It is not a software bug. The issue in the thread and yours is a combination of BCD in EFI partition, MBR limitation of 4 entries, and manually creating an additional partition. This is unsupported under a BIOS/MBR installation due to limitations of MBRs (4 entries) and three partitions already in use - EFI, OSX and Recovery HD.

The other method of W8.1/10 installation is GPT/EFI which is supported on your Mac. I have it installed on a 2013 rMBP using this method. The BCD is no longer stored in the EFI partition. It requires creating a Free Space partition which is split into MSR/MSD parts. This method uses GPT-only disks, which allows you to create additional partitions using DU.

You must still install BC drivers for Apple hardware to work properly in Windows.

Thank for your explanation, it helps me to understand more about EFI/MBR.

For my case, I installed a fresh W10 using BootCamp and I did not see a warning from DU when using it to create the new partition.

I decided to reinstall Windows. Appreciated your support and patience.

Did you install Windows 10 using EFI Boot?

I used BootCamp to install, not sure if it's EFI boot as you said. I'm heavy user of Windows for more than 20 years but quite new to MAC

Run msinfo32 and check BIOS mode.

Yes, that is UEFI mode.

If you used the standard BCA method, your BCD is sitting in the EFI partition. You can use the steps in Re: Can't resize Macintosh HD partition and check if you have a Microsoft directory structure on the Mac's EFI partition.

Thank for your suggestion, but I already reinstalled Windows to get rid of this issue.

Be aware that this issue can come back, even if you do not re-partition, if the BCD in EFI directory is touched by OS X.

Hello Loner T,

I have a similar issue. I will create a new post as that is what you seem to request.

El Captain: windows 10 Bootcamp not recognizing after temporary partition

So after I hold Command+R after restarting my Macbook Pro, it tells me it's going into Internet Recovery. Then when I load Utilities > Terminal and type csrutil disable, it tells me the command is not found. If I type csrutil status when booting normally, it recognizes the command. Why is this happening?

Please start a new discussion which will make it coherent and easier to solve.

So I followed it, and now it does boot into Windows but it's stuck at the "Starting Windows" screen and doesn't do anything. Please help

I Also did the startup repair thing aswell, and it still won't boot.