Lost Windows partition after upgrading to Yosemite

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Lost Windows partition after upgrading to Yosemite

Hi all,

Hope you can help since upgrading my Mac OS to Yosemite, I have been unable to log back into my Windows Partition. If i hold alt on start up on the mac disk is shown. I have seen a few similar issues on this forum and been trying to follow the post but struggling a little now so wondered if some could help with next step

This seems to be the info from the other threads. I have installed the test disk utility and done a analyse on the disk, i'm little unsure of what to do now, i would like if possible to go back into the windows instead of reinstalling as i have quite a bit of data on that side of the disk.

Any help massively appreciated Dave

Posted on Feb 4, 2015 4:14 PM

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Answer 1

drfailbadger Author

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Feb 4, 2015 4:28 PM in response to drfailbadger

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Answer 2

Loner T

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Feb 4, 2015 4:33 PM in response to drfailbadger

Can you post the output of the following command?

sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C (This will dump the NTFS header).

Just saw your output. You do not have a valid NTFS header. Please see https://imgur.com/a/PjmnK for screen sequence of Testdisk.

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Answer 3

drfailbadger Author

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Feb 4, 2015 4:31 PM in response to Loner T

Sorry Loner T i noticed i missed it so popped it above.

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Answer 4

Loner T

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Feb 4, 2015 4:34 PM in response to drfailbadger

I missed it too. Please see the IMGUR link for the Deeper Search after you select the first MS Data partition.

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Answer 5

drfailbadger Author

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Feb 4, 2015 4:37 PM in response to Loner T

Ok thanks, i'll start the deeper search and let you know i think it might be some time, as the quick search took over a hour

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Answer 6

Loner T

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Feb 4, 2015 4:58 PM in response to drfailbadger

Deeper Search is a sector-by-sector scan of the disk. It can take several hours, depending on the size of the disk. SSDs are in general faster than HDDs.

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Answer 7

drfailbadger Author

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Feb 5, 2015 12:12 PM in response to drfailbadger

Hey Loner T, sorry the deeper search took a lot longer than expected. Although i seem to have the same page now as the previous search any help would be much appreciated.

Do i just click continue?

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Answer 8

drfailbadger Author

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Feb 5, 2015 12:41 PM in response to Loner T

Sorry I replied to the main post and not your comment.

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Answer 9

Loner T

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Feb 5, 2015 1:01 PM in response to drfailbadger

Yes, please click Continue. It should give you a Deeper Search option.

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Answer 10

drfailbadger Author

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Feb 5, 2015 1:14 PM in response to Loner T

Loner this is what I did last night the same list came up I went down one and selected deeper dive, and this is what it came back to, not sure if i'm doing something wrong.

P.S this is the next screen