In my MacBook Air "El Capitan", the Windows 10 was installed using Boot Camp, but the Windows 10 installation was corrupted (crashing).
Then I removed (adding space to MAC installation) the Windows 10 partition using Disk Utility.
Now when I turn On my MAC still message windows is appearing (showing MAC and Windows start options), and the default OS was Windows (appearing blue screen...).
I want to remove Windows 10 option, but I don't know how to do it.
sh-3.2# diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 120.5 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +120.1 GB disk1
Logical Volume on disk0s2
22ACF9AD-58C6-401F-87D6-41696160E1FD
Unencrypted
sh-3.2# gpt -r show /dev/disk0
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 235298960 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
235708600 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
236978136 7
236978143 32 Sec GPT table
236978175 1 Sec GPT header
sh-3.2#

