Delete a failed bootcamp partition MacBook Pro
I recall a few years back I had difficulty removing a boot camp partition with the boot camp utility.  I wound up using disk utility to remove the boot camp partition and resize my Macintosh hard drive back to its initial state.



Select the book camp partition in the pie chart and then just hit the minus button beneath



After that I just wound up using the Boot Camp utility again to start the whole process over of creating a new partition for Boot Camp