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I've look around here and Apple's support community, but can't find my exact issue. I recently reinstalled Windows 10 to my MacBook Pro (Mid 2012), added a partition to start on installing Linux, and now OS X doesn't see the Windows 10 partition at all. I can still hold down alt/option to start it up, but I would like to have the option to have it automatically start to Windows 10, which I don't anymore.

sudo fdisk /dev/disk0 returned the following:

Disk: /dev/disk0    geometry: 29185/255/63 [468862128 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE    0   0   2 -   25 127  14 [         1 -     409639] <Unknown ID>
 2: AF   25 127  15 - 1023 254  63 [    409640 -  233553880] HFS+        
*3: 07 1023 254  63 - 1023 254  63 [ 234225664 -     204800] HPFS/QNX/AUX
 4: 07 1023 254  63 - 1023 254  63 [ 234430464 -  234428416] HPFS/QNX/AUX

sudo gdisk /dev/disk0 returned this:

Disk /dev/disk0: 468862128 sectors, 223.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): F33219B5-A986-430B-8674-23055706EF16
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 468862094
Partitions will be aligned on 8-sector boundaries
Total free space is 234693781 sectors (111.9 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       233963519   111.4 GiB   AF00  Untitled
   3       234225664       234430463   100.0 MiB   0700  BOOTCAMP

Of course, Disk Utility was SO helpful by showing this: Disk Utility being Helpful

I don't want to reinstall Windows 10 AGAIN, and I can't seem to find any information that actually helps with this issue. Any assistance would be appreciated.

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As you stated, you can hold down the option key at startup to invoke the Startup Manager. If you hold down the control key while selecting one of the displayed partitions, then chosen partition will become the new default startup partition.

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  • The actual answer I ended up using was the exact one I wanted to avoid. I installed Refind and am successfully using it to control boot up. I do appreciate this option, though I'm not sure it would work if OS X doesn't see the partition I would be choosing. – Andrew Wallace Jul 8 '16 at 3:43

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