I just upgraded to El Capitan. Now my Bootcamp is not available upon start-up. How do I get it back?
iMac (21.5-inch, Late 2012), OS X El Capitan (10.11.2)
I was able to pull some data from Diskutil. Maybe this can be interpreted by someone?...
Can you post the output of the following commands?
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
What is the version of Windows?
Thanks for your quick response! The version of Windows that's on the Bootcamp drive right now is 8.1. I want to get that to 10 asap, but need to recover what I had first. Here's the other output...
f
El Capitan requires disabling SIP to manipulate partitions. This will not work if you boot into Internet Recovery (Command+Opt+R), but only works in Local Recovery (Command+R).
1. Boot into Local Recovery (Command+R).
2. Start Utilities -> Terminal.
3. Type csrutil disable in Terminal and press Enter/Return.
4. Type csrutil status.
5. Boot normally, and type csrutil status to confirm that all individual entries are still disabled.
Once SIP is disabled, run the following steps.
sudo fdisk -e /dev/disk0
p
setpid 4
07
flag 2
p
w
y
Reboot and Test.
I think we're making progress. I followed the above and I was able to boot into OSX no problem. Then I tried to boot into bootcamp by holding the option button. I did see the "Windows" drive so I clicked on that hoping 8.1 would come back up. But I got an error message saying "Missing Operating System."
1. Can you post the output of
sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C
2. You may need Bootrec.exe and/or Startup Repair - https://support.microsoft.com/en-us/kb/927392 .
This looks good. You need Windows startup repair using the Windows Installation media built by BCA and Windows ISO, as appropriate, from https://www.microsoft.com/en-us/software-download/home.
Thank you very much, you have been very helpful!
Before I download anything from the Windows site you mentioned above. What exactly should I be downloading and should it be for Windows 8.1 (which was originally installed on my bootcamp) or should it be under Windows 10, which is what I was trying to upgrade to?
You will need to use the same version as the one currently installed. If W10 is a future state, you cannot use it to repair the W8.1 installation and vice-a-versa.
ok, thank you. You really helped out a lot!
Once you build the installer, try the Repair. If you run into any issues with recovery/repair, please post back on this discussion.
Well, I couldn't do the repair route, so I decided to reinstall Win 8 from the beginning. I partitioned the HD to 800GB for OSX and 200GB for Win. Previously I only had 100GB for Win, which is why I couldn't upgrade to Win 10.
So...I've got 2 new boot drives: Windows and EFI Boot. I tried Windows first and it just gave me a blank screen. Then I tried EFI Boot and it gave me the error that Windows cannot be installed on MBR partition table, only GPT disks formatted as NTFS.
I partitioned the drive using the BCA, so not sure what happened here. Any thoughts?
Mike
The error message is correct. EFI Boot will not work properly. Does Windows selection give a you light black screen with a blinking cursor? Do you have a physical DVD of W8?
yes, black screen with blinking cursor. Yes, I have a DVD of w8.
Bootcamp disappeared. How do I get it back?
