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After I updated to OS X Yosemite last night, my Windows 7 partition was gone.
I'm not able to see it when I press down OPTION during boot, but I do see a strange name "disk0s4" under disk utility.
Can anyone help me out here?
MacBook Pro (Retina, Mid 2012), Windows 7
You will need Windows Startup Repair. Please also see https://support.microsoft.com/en-us/kb/927392.
I used it but windows couldn't recover.
I ran command prompt as the website you wanted me to check out, but didn't work.
Is it possible I ran something wrong at the Mac OS X end?
Or did I just not get the windows command prompt part right?
Please advise, thanks!
Please post the output of
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
Your MBR is incorrect. You have entered 'n' where it should not be entered. Please see the second set of Gdisk steps, and the example below it. I will paste it here again. You need to repeat the second set of Gdisk commands again.
Please post a screen shot when you do this.
Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers.
Here is sample Q&A for this section. Please notice the Press Enter/Return.
Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y
Creating entry for GPT partition #2 (MBR partition #2)
Enter an MBR hex code (default AF): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #3 (MBR partition #3)
Enter an MBR hex code (default AB): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): Press Enter/Return
Set the bootable flag? (Y/N): Y
Is this correct?
This is incorrect. You are making the same mistake again.
Did you see the following three entries in my example? Please repeat the steps again.
Enter an MBR hex code (default AF): Press Enter/Return
Thanks so much, I finally got it!
You are more knowledgeable than any apple support I have encountered haha.
Thank you again!
Is Windows now up and running?
Yes it's up and running now, but I haven't restarted the computer yet.
Hope nothing goes wrong after reboot haha.
Please test switching between the OSes and make good backups of OSX an Windows as a base line.
Yes after this incident I think I will make good back ups..
One more thing, I'm not able to access the Mac drive anymore when I'm in bootcamp, I was able to do that before.
Please take a look here:
I'm not able to click on the D drive which the drive mac is installed on...
The OSX volume is now a Core Storage volume as shown by the output of diskutil cs list. The output shows that it is revertible. Please execute the following command on the OSX side in Terminal.
diskutil cs revert disk1
After this will I still be able to use Windows 7 as usual?
Yes, this only changes the OSX volume and converts it from CS to JHFS+, which has a Windows driver.
Bootcamp Windows 7 disappeared after OS update last night...
