Windows 7 partition gone after installing Yosemite

I have the same problem too

Bootcamp gone after Yosemite Install

Hi Loner T,

I'm having the same issue as well. Hopefully this issue can be resolved. I don't want to revert to my last backup since I will be missing some data.

Window 7 Bootcamp missing after Yosemite 10.10.5 Install

Hello,

Here is the link to my output. I can really use your help! Thank you!

@Loner T: Boot camp missing after El Capitan - My output

Hey, I need help with possibly recovering a Windows 10 bootcamp I had. I'm on a mid-2012 MacBook Pro, and Windows 10 was booting fine. I decided one day to boot back into OSX (10.8) and just play around with it a bit. When I tried to get back to Windows though, I found that it had been replaced by a greyed out 'diskOs4' in disk utility that could not be mounted. Holding down option also could not read it.

Please start a new discussion. El Capitan Upgrade can cause problems with installed Windows. It may still be recoverable.

From/run Applications -> Utilities -> Terminal, triple-click each of the following highlighted lines, Copy each line using (Command+C) and Paste (Command+V) in Terminal window. Post the output and after editing it to remove any personal information.

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

Im not on Capitan, I am on OSX 10.8 (cant remember the cat name of it...) and I didnt upgrade my OS or anything when this happened. All I did was boot into OSX to grab some files I left in it to transfer to windows.

Heres the output:

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 100.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 64.0 GB disk0s4

No CoreStorage logical volume groups found

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 976773167

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 195312496 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

195722136 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

196991672 654781768

851773440 124999680 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773120 15

976773135 32 Sec GPT table

976773167 1 Sec GPT header

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 195312496] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 195722136 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [ 851773440 - 124999680] Win95 FAT32L