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A while ago I wrote about how to set up a modern Mac to boot into Windows (or Linux), as well as Mac OS, but using three hard drive partitions. As standard, the Mac OS Boot Camp utility only works with two (see Tips for setting up Bootcamp with three partitions)

Due to the amount of video and photos I’m creating now, I wanted to get rid of that third hard drive partition so as to make more space for Mac OS. But deleting the additional partitions caused Windows on the Boot Camp partition to stop working. If this happens to you here’s how to fix, or to avoid:

To avoid the problem – Instead of deleting the additional partition, resize it to be the smallest amount possible (in my case about 800MB) instead using Disk Utility. This third partition should be between the Mac partition and the Boot Camp partition on your disk.

To fix, if you’ve already deleted it and gone to two partitions:
- Resize the Mac OS partition to be about 900MB smaller.
- Create a new 3rd partition in the newly unused disk space and call it the same name as your original 3rd partition.
- That’s it!

Don’t touch the actual Boot Camp partition at any time with Disk Utility or the Boot Camp utility during the above steps, unless you feel braver than me.