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"OS X Can't Start up from this disk"

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fhadso said:
When I go to install/upgrade Mavericks, I can select my current installation but it says that it can't startup from that partition. I'm currently running 10.8.5 and dual booting Windows 8.
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At what step in the guide are you? It is not clear from your description. And what "says that it can't startup..."?
 
fhadso said:
At the disk selection screen. Where you choose which disk/partition you want to install OS X. Literally the second screen in the installation. Like I said, I'm installing onto an existing installation of 10.8.5.
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Is your disk partitioned as GPT? Check in Disk Utility.
 
fhadso said:
I didn't think of that. I assumed it was GPT. It's not. It's MBR. I didn't even know OS X could boot from MBR. I'm backing up my data as I type this so I can reformat my drive as GPT.
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It can boot from MBR, but not modified, the OS X installer will not install to an MBR.
 
I have that exact problem, too.
Although in the Disk Utility it says that the harddrive with my Mountain Lion installation is GUID and the separate hardrive on which I have Windows installed is MBR.
Any experience or help in that regard?
 
Dotile said:
I have that exact problem, too.
Although in the Disk Utility it says that the harddrive with my Mountain Lion installation is GUID and the separate hardrive on which I have Windows installed is MBR.
Any experience or help in that regard?
Click to expand...

What problem?
 
I can't select the Mountain Lion harddrive in the disk selection screen, right after the language selection of the Mavericks Installation.

Edit: I just realized that this thread was original posted in a notebook sub-forum. I am running a desktop system, but replied since this is the exact same issue I have.
 
Dotile said:
I can't select the Mountain Lion harddrive in the disk selection screen, right after the language selection of the Mavericks Installation.
Click to expand...

What is the error message? Show a screen shot of what you see in Disk Utility.
 
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