Boot Camp will not allow removing Windows 8 partition I've used Boot Camp to install Windows 8 on my Air some time ago and I was trying to remove the windows partition to restore some space. Except Boot Camp gives me a warning saying "The startup disk cannot be partitioned or restored to a single partition."

This is what my disk setup looks like.

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            80.0 GB    disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:         Microsoft Reserved                         134.2 MB   disk0s4
   5:       Microsoft Basic Data BOOTCAMP                40.3 GB    disk0s5


I'm pretty sure the Microsoft Reserved (disk0s4) partition is giving me the problem right now. I can't mount it or do repair on it from disk utility.

I've called Apple support to get help but they spent 10 minute explaining 10 different ways I can pay them to receive help.
Maybe there is a way to get this working but I and some technicians haven't found it. BootCamp got me hard headaches some times.

The fastest way would be to make a backup of your Macintosh HD (create a disk image) and partition the whole drive. Delete all partitions, apply, then create a new one and apply. Be sure to set the partition type to GUID.