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Nov 28, 2014 7:34 PM in response to Loner Tby BeyondJupiter,Hey,
I have this very same problem, after upgrading to Yosemite I lost my Windows 7 which I installed on the bootcamp-partition.
On this partition I had directly installed with a build-in partition of 25gb and afterwards I added another 25gb due tolater apps I had to install which I didn't think of at the time of setting up the partition in the first place. I did this throughout 'disk-utility' and rendered 25gb unclaimed by either partition and then in the bootcamp using a wizard. (an app vouched for in the walkthrough on Youtube) What's interesting though was that after upgrading the 25gb I later added was send back to macintoshHD (the original partition) and the other one as you've read before was a damaged 'Disk04'.
To repair the remaining 25gb I accepted my losses and first deleted the contents of DISK04 and also deleted something else from it within 'Disk-utility' now it re-named itself to '04' and then later i clicked the main partition (in the bar left you have 2 sub-partitions and the main partition should still be called macintoshHD). There I deleted the entire 04 partition and the remaining 25gb that was first lost found it's home again.
I get that most of us probably want to rescue their partitions but I've been toughened by windows and the rough edges of bootcamp and already know it would either be a lost effort or take double if not triple the time needed to just install it all overnight.
Best of luck all, hope it works!
BeyondJupiterHD (Christophe)
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Nov 30, 2014 5:01 PM in response to BeyondJupiterby drizzy19,This same thing happened to me. I upgraded to Yosemite and all of a sudden couldn't boot into my Bootcamp partition. After spending hours trying to find the solution, I cut my losses and tried to reinstall Windows in Bootcamp only to find that it now won't even complete the installation. It goes through the Windows Installation process but when it reboots after "Complete Installation", I just get a black screen every time. I reached out to Apple Support and, while the guy was patient and helpful, he put me through the exact same process that I had been following, and didn't stay with me long enough to see it fail AGAIN.
Any advice?
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Nov 30, 2014 5:04 PM in response to drizzy19by Loner T,Can you start a new discussion and post the diskutil, gpt and fdisk commands?
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Nov 30, 2014 5:23 PM in response to Loner Tby sandyblade,Hi Loner T,
Please help on my thread Missing Operating System after installing OS X Yosemite