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Windows 10 Partition Disappeared After Installing El Capitan

@Loner T -- seems you have helped several others on this issue and hope you can help me through it too. I have an early 2013 MBP with a 500 GB SSD. I allowed the upgrade to El Capitan and like others this made the boot camp partition disappear. Holding the option key when booting only displays the option to boot into OS X. Here's what I've done so far:


- SIP is disabled. Confirmed after rebooting normally by typing csrutil status

- Tried to make the other partition bootable by using your instructions on

-- fdisk -e /dev/disk0

-- p

-- setpid 4

-- 07

-- flag 4

-- p

-- w

-- y

After quitting, I rebooted and hit option. Windows now appears when I hold option down, but when selecting it I get the error "Operating System Missing"

Here's the output from all of the other commands:

diskutil list gives:

/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 Macintosh HD 300.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 101.0 GB disk0s4

/dev/disk1 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +299.6 GB disk1

Logical Volume on disk0s2

DAED883D-1E3E-48A7-A986-A2C2E5483BE7

Unencrypted

diskutil cs list displays

User uploaded file

gpt -vv -r show /dev/disk0 displays:

User uploaded file

sudo fdisk /dev/disk0 gives:

User uploaded file

I figure all this means I have a lost partition as you have described to others. I downloaded Testdisk and gdisk. Testdisk output:

User uploaded file

Running a Quick Scan on Test disk and see these unrecoverable partitions (dumb question does that mean these are lost for good or that they are good and don't need to be recovered?):

User uploaded file

Then Continuing:

User uploaded file

Selecting P here produces:

User uploaded file

Are these the values I can use in steps 7 and 8 in this post?

MacBook Pro with Retina display, OS X Mountain Lion (10.8.5)

Posted on Nov 29, 2015 2:02 PM

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Question marked as Best reply

Posted on Nov 29, 2015 2:35 PM

Step 7 - 587618304

Step 8 - +388564992


In the first set of Gdisk steps. The second set of rebuilding MBR is the same for a standard BC setup.

4 replies

Nov 30, 2015 5:53 AM in response to StrikeEagleIII

Glad to see it working.

StrikeEagleIII wrote:


Has this been up-channeled to Apple? This seems like a fairly major bug in the El Capitan update.

In most cases, this is a result of a past resizing/re-partitioning operation after Windows is in place. I have tracked it on Yosemite and provided feedback to Apple folks. Cloning of Windows or migration between Macs can also lead to similar issues.

Windows 10 Partition Disappeared After Installing El Capitan

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