El Capitan has deleted my bootcamp windows partition

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El Capitan has deleted my bootcamp windows partition

I upgraded to El Capitan and now my Windows 10 partition has disappeared. After googling the problem, it seems to be related to having resized my windows partition - which I did when I upgraded to Windows 10, after upgrading to Yosemite but before upgrading to El Capitan... I attach the following screen-shot which seems to be the first of the questions that gets asked:

I also tried to install gdisk 1.0.0 but I get a warning message when I do. I tried ignoring the message and installing anyway, but it seems to fail to install.

Any help would be greatly appreciated as I don't think I can face having to reinstall everything from scratch.

iMac, OS X El Capitan (10.11), Windows 10 boot camp partition

Posted on Oct 12, 2015 2:12 PM

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Answer 1

Loner T

Level 9

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Oct 12, 2015 2:16 PM in response to Biggles293

Yet another victim of the Malady. 😟 Can you use @Loner T: Boot camp missing after El Capitan - My output as a reference and run Testdisk scan?

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Answer 2

Biggles293 Author

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Oct 12, 2015 2:23 PM in response to Loner T

Hi Loner T

Just the guy I was hoping would respond. Thanks. I have just downloaded testdisk 7.0. Do I need to actually install it, or do I just click on the testdisk executable icon in the downloaded folder? Sorry I have very little idea what I am doing...

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Answer 3

Loner T

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Oct 12, 2015 2:29 PM in response to Biggles293

Start a Terminal window. Change Directory (cd) to where the Testdisk is located. It is a Terminal program.

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Answer 4

Biggles293 Author

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Oct 12, 2015 2:44 PM in response to Loner T

Ok I have got this:

I then select the /dev/rdisk0 - 320 GB / 298 GiB (RO) and Proceed, and I get this:

Should I try unmounting each volume or just continue?

I've just taken a look at the disk Utility and my unmount button is grey and can't be selected...

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Answer 5

Biggles293 Author

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Oct 12, 2015 2:46 PM in response to Biggles293

Given that I couldn't unmount, I have just pressed proceed anyway...

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Answer 6

Loner T

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Oct 12, 2015 2:46 PM in response to Biggles293

Use EFI/GPT.

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Answer 7

Biggles293 Author

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Oct 12, 2015 2:51 PM in response to Loner T

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Answer 8

Loner T

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Oct 12, 2015 2:55 PM in response to Biggles293

What are the options at the bottom of your Testdisk window?

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Answer 9

Biggles293 Author

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Oct 12, 2015 2:57 PM in response to Loner T

Oh sorry, I missed that bit...

Quick Search or Backup

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Answer 10

Loner T

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Oct 12, 2015 2:59 PM in response to Biggles293

Quick Search.

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Answer 11

Biggles293 Author

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Oct 12, 2015 3:02 PM in response to Loner T

Then pressed continue.

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Answer 12

Loner T

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Oct 12, 2015 3:04 PM in response to Biggles293

Scroll down to the second MS Data, and press 'p' to list files. I would expect to see something similar to the following...

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Answer 13

Biggles293 Author

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Oct 12, 2015 3:09 PM in response to Loner T

I selected the second line from the bottom, which was the second occurrence of MS Data:

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Answer 14

Loner T

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Oct 12, 2015 3:13 PM in response to Biggles293

The MS Data line has three numbers, which are sector addresses on disk - Start, End and Size respectively. Start a new Terminal window, run the solution set of Gdisk steps in the linked thread. Substitute the values specific to your output in steps 7 and 8 respectively (step 8 value needs a '+' sign in front of the Size number).

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Answer 15

Biggles293 Author

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Oct 12, 2015 3:23 PM in response to Loner T

Sorry I cannot find the solutions set of Gdisk steps you are referring to... Can you provide the direct link please?

I am presuming I need to do the csrutil disable step in the recovery boot, so I am just going to do that now...

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