Q: Two Windows partitions after installing Boot camp?

Unfortunately that isn't the case. This is actually a bug in OSX Boot Camp. It's still unresolved by Apple. Unfortunately when you install Windows from Boot Camp but uninstall without Boot Camp, it will leave a Windows partition there that you cannot remove.

Exoma wrote:

 

Unfortunately that isn't the case. This is actually a bug in OSX Boot Camp. It's still unresolved by Apple. Unfortunately when you install Windows from Boot Camp but uninstall without Boot Camp, it will leave a Windows partition there that you cannot remove.

This is not a bug. If you use BCA, the remove must also use BCA, not Disk Utility. This is documented in Boot Camp: Remove Windows from your Mac .

If you have used DU to erase (not remove the partition), reformat it as FAT32 and retry the BCA method as shown in the link.

The partition does not show on Disk Utility anymore so perhaps DU thinks it's been deleted but it hasn't, right?

How do I reformat the partition to FAT32 if it doesn't even show in DU?

From Applications -> Utilities -> Terminal, please post the output of the following commands.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

The "sudo" command will prompt you for your password, which will not be echoed back to you.

Thanks! I got this:

gpt show: /dev/disk0: mediasize=500277790720; sectorsize=512; blocks=977105060

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 977105059

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  180396416      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

  180806056    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  182075592       1848        

  182077440   15622144      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  197699584       2048        

  197701632  778481664      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976183296     921600      6  GPT part - DE94BBA4-06D1-4D40-A16A-BFD50179D6AC

  977104896        131        

  977105027         32         Sec GPT table

  977105059          1         Sec GPT header

Not quite sure what I need to do next. I have both OSX and Win10 installed on my computer. I also have an extra Windows option in the boot up that I can choose. I'm trying to get rid of that.

Can you post the output of the two diskutil commands?

diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage APPLE SSD SM0512G Media 92.4 GB    disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data OSXRESERVED             8.0 GB     disk0s4

   5:       Microsoft Basic Data BOOTCAMP                398.6 GB   disk0s5

   6:           Windows Recovery                         471.9 MB   disk0s6

/dev/disk1 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS APPLE SSD SM0512G M... +92.0 GB    disk1

                                 Logical Volume on disk0s2

                                 B14AC65B-D8F6-49E5-B099-603FDF0CEA0D

                                 Unlocked Encrypted

Trying to post the other diskutil command but the Apple forums won't let me. Keeps saying "The message contains invalid characters".

1. Your Windows Installer (OSXRESERVED) should have been deleted, if Windows installation was successful.

2. You have Windows Recovery (disk0s6). Was Windows installation completed successfully?