It's varying degrees of fragility. No hybrid MBR is stable. A hybid MBR is more fragile, but relatively stable if there are only four total partitions. As soon as you have 5 or more, you're off the rails. So just don't let anything change partition sizes, add or remove them. Ever. Until you're ready to lose all data. And then if it ends up somehow working out, consider it a bonus.
Hi Christopher - You seem like the guru with regards to this
I'm having a similar problem here: Any chance of you having a look at the problem. Much appreciated
I had the same problem in this post mentioned. Hopefully, I can boot up windows 8.1 with the steps and result you mentioned. Except....I can only see the Windows partition when I boot it up and cannot choose neither OSX or Recovery partition. I cannot read through the content of Mac drive as well. Here is the display of gdisk with windows. Look forward your comment. Thanks.
Command (? for help): p
Disk 0:: 976773168 sectors, 465.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): EAAAD34C-E30F-47B2-8463-1C900514EEA7
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 8-sector boundaries
Total free space is 589 sectors (294.5 KiB)
Number Start (sector) End (sector) Size Code Name
1 40 409639 200.0 MiB EF00 EFI System Partition
2 409640 622917287 296.8 GiB AF00 Mac_Mou.Lion
3 622917288 624186823 619.9 MiB AB00 Recovery HD
4 624187392 781461503 75.0 GiB 0700 EXFAT
5 781461504 976773119 93.1 GiB 0700 BOOTCAMP
Command (? for help):
Hi Christopher, and anyone else who can help.
I'm afraid I've fallen into the same trap as those before me, using Disk Utility to decrease the size of my OS X partition, with a view to then increasing my Windows 8 parition – which of course I could not boot to after resizing the OS X partition. All files are backed-up from my windows partition, so it's no problem if I have to ultimately re-install.
I'm using 10.6.8 (Snow Leopard) and Windows 8. (Mid 2010 MacBook Pro, 512Gb SSD)
1 OS X Partition, 1 Windows 8 Partition.
I've read as much of this thread as I can, and followed the guidlines to repair. It seemed to work, but when I tried to boot windows, i got the "missing operating system" message – as I have seen a few people get here.
Following the advice given here i repeated the process, making a new hybrid MBR adding 2 and 3 to it, with 3 being bootable. To no avail, I get the same "missing operating system" error.
Can anyone advise on what to try next? If it looks like my windows is completely trashed, what is the safest way to return my OS X drive to its full capacity (512Gb) and then re-install Bootcamp?
Here is the state of things now (below). I can provide more info if needed. I've tried to be concise.
Please look here - https://discussions.apple.com/message/24073035#24073035
The DD command should help.
The wonders of the F8 key are gone. Since you use W8+, try the shift key.
Ok, that worked! I managed to get through to the recovery console where I ran /FixMbr and /FixBoot. (the command prompt returned succesful)
However, now when I reboot holding option, and select Windows, nothing happens. The screen freezes, and the computer doesn't try to do anything.
When I boot to OS X and go to System Preferences - Startup Disk, the Windows Bootcamp option is no longer there, so I can't force the comp to restart to Windows. I'm not sure exactly when Bootcamp dissapeared from Startup Disk, it may have already gone before I attempted these latest steps.
So just to summarise, I can see Windows as a bootable partition when restarting holding the option key, however nothing happens when I select it. And I cannot see Windows from within OS X's Startup Disk preferences pane.
My results for [sudo gpt -r -vv show disk0] and [sudo fdisk /dev/disk0] are still the same as they were earlier (pictured in my initial post above).
In this time I probably could have reinstalled Windows, are got the programs I need up and runing again! Should I just look at doing this? Like I said, I have every file I need backed up.
It's worth mentioning that I have an old hard drive with a fully functional OSX Mavericks / Windows 8 setup (i don't use this hard drive for anything, I had just used it to test installations). Would it be worth using Winclone to copy that version of Windows to my current hard drive, instead of installing Windows all over again?