Can't boot into Bootcamp partition anymore?

Question

Can't boot into Bootcamp partition anymore?

Hi, everyone. After using Disk Utility to resize my MacOS partition (without doing anything to the Windows partition), I can no longer boot into my Bootcamp partition. Disk Utility still detects it, and nothing appears to have changed, but I can't boot into it anymore. It doesn't appear in the Startup Manager, and switching to it using the Startup Disk utility in System Preferences results in a white screen for a couple of minutes after rebooting, and then a black screen with "No bootable devices found. Please insert boot disk and press any key." on it. I have no idea what could have possibly caused this, as I didn't try to resize or mess with the Windows partition at all. Please help!

My MacBook: 13-inch early 2011 MacBook Pro

Mac OS X version: High Sierra version 10.13.6

Windows version: Windows 7 Ultimate 32-bit

MacBook

Posted on Mar 25, 2020 8:40 PM

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Answer 1

Loner T

Level 9

59,471 points

Mar 27, 2020 4:08 AM in response to fail_sandwich

4:                  Apple_HFS Untitled                18.7 GB    disk0s4
5:       Microsoft Basic Data BOOTCAMP                80.0 GB    disk0s5

You created the 18GB (disk0s4) partition. This is not supported, once Windows is installed on your Mac.

Post the output of

sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

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Answer 2

Mar 27, 2020 10:40 PM in response to Loner T

I didn't have the time to try it out until now, and sadly it did not work 🙁 I followed the instructions as closely as possible, but the Windows recovery tool kept failing. Luckily I didn't have any important files on it, so it's not a massive life-ruining issue, but it's still quite annoying. Again, thanks for your help, and I hope you have a much nicer day than I did.

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