Missing Operating System after installing Linux Mint

Question

HiI&#x27;m running OS X 10.11.3 El Capitan and disabled SIP to install Windows 10 on it. All worked well... Then I installed Linux Mint. OS X and Linux Mint boot well but when booting Windows through rEFInd, the error that gets shown is Missing Operating System.Browsed through the forums a little and I know Loner T can definitely help me!Here&#x27;s my output➜  ~  diskutil list/dev/disk0 (internal, physical):   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:      GUID_partition_scheme                        *500.1 GB   disk0   1:                        EFI EFI                     209.7 MB   disk0s1   2:                  Apple_HFS Macintosh HD            124.9 GB   disk0s2   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3   4:           Linux Filesystem                         24.3 GB    disk0s4   5:       Microsoft Basic Data BOOTCAMP                250.0 GB   disk0s5   6:                 Linux Swap                         8.0 GB     disk0s6➜  ~  sudo gpt -v -r show /dev/disk0 gpt show: /dev/disk0: mediasize&#x3D;500107862016; sectorsize&#x3D;512; blocks&#x3D;976773168gpt show: /dev/disk0: Suspicious MBR at sector 0      start       size  index  contents          0          1         MBR          1          1         Pri GPT header          2         32         Pri GPT table         34          6                 40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B     409640  244041120      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC  244450760    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC  245720296        792          245721088   47460352      4  GPT part - 0FC63DAF-8483-4772-8E79-3D69D8477DE4  293181440   15624192      6  GPT part - 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F  308805632  179687424          488493056  488280064      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7  976773120         15          976773135         32         Sec GPT table  976773167          1         Sec GPT header➜  ~  sudo fdisk /dev/disk0          Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]Signature: 0xAA55         Starting       Ending#: id  cyl  hd sec -  cyl  hd sec [     start -       size]------------------------------------------------------------------------1: EE    0   0   1 - 1023 254  63 [         1 -     409639] &lt;Unknown ID&gt;2: AF   25 127  15 - 1023 254  63 [    409640 -  244041120] HFS+       3: AF 1023 254  63 - 1023 254  63 [ 244450760 -    1269536] HFS+       *4: 83 1023 254  63 - 1023 254  63 [ 245721088 -   47460352] Linux files*

Loner T · Accepted Answer

1. What year/model is your Mac?2. Your MBR has no entry for Bootcamp. 3. There is a large free space gap between GPT5 and 6. Is that intentional?4. Please post the output of     sudo dd if&#x3D;/dev/rdisk0s5 count&#x3D;1 2&gt;/dev/null | hexdump -C

aayushkapoor206 · Answer

1. It&#x27;s i5 2012 version2. Yes, I manually added one to fdisk from gdisk3. It was intentional as I wanted to install more linux distros. But I won&#x27;t be now! 😝4. I fixed it by first removing Mint and Swap space after booting from Gparted. It wasn&#x27;t helpful. Then edited the 4th partition under fdisk by copying over info from gdiskIs the number of partitions under fdisk limited to 4? Because diskpart didn&#x27;t detect more than that. I believe it was updating grub2 on Mint that caused the problem. Thanks!

Loner T · Answer

A MBR only supports 4 entries. You can combine contiguous GPT entries into a single MBR entry. Such combinations do result in loss of visibility to individual partitions. Can you adjust the MBR as necessary so the Windows partition is an entry in the MBR and then test?