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Installation Help Needed - UEFI Windows & OS X on same drive


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#1
ohmy

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I managed to get all the way to that installation screen!

But I've been having problems getting to the actual installing part. I'm trying to avoid losing the pre-installed Windows already on the drive, so I used a MBR patch, I've tried formatting the partition I want to install it on to FAT32 and NTFS and it doesn't seem to change the problem. I'm not really sure what's wrong.98VJopv.jpg



#2
Gringo Vermelho

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Stop what you're doing and run chkdsk /r from a Windows elevated commmand prompt before proceeding.

 

Disk Utility cannot work with NTFS volumes. Format it as FAT32 from Windows first, then you can re-format it as HFS+J with Disk Utility.



#3
ohmy

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Thanks for the quick reply. I've tried the 'chkdsk /r' command and it doesn't detect any errors, and it doesn't seem to have changed anything. I tried FAT32 a few moments ago but the disk utility is still throwing up that 'Disk Error' popup whenever I try to select any partition.



#4
Gringo Vermelho

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I don't mean to pry but, do you need those other four partitions? A total of six seems an awful lot of partitions for a 750 GB drive.

 

Are those recovery partitions or something like that? Are any of them accessible from within Windows?

 

It seems that whoever did that was using some weird partitioning scheme that Disk Utility doesn't agree with.

Maybe the partition table is just corrupt...usually testdisk will take care of that sort of thing.



#5
ohmy

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I'm not really sure what's up, testdisk didn't seem to pick up anything.

 

6gCO00t.pngBut this is how the partitions are set out, they seem needed.



#6
ohmy

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Anything else I can try? Or is there nothing I can really do?



#7
Gringo Vermelho

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Disk Utility doesn't like the partition scheme used on your HDD. I don't know why, I don't know much about hard drive partitioning. I keep my OS on separate drives. It looks really messy, two recovery partitions and one "OEM partition" whatever that is. And Disk Manager shows them all as 100% free which can't be right. Those "128 MB unallocated" barrier-partitions are normal though.

 

I see a 260MB EFI partition, Windows must be installed in UEFI mode, and your drive uses GPT (GUID Partition Table, as opposed to MBR). I wonder if that has anything to do with it.

 

The 29.05GB partition is for OS X right? Try configuring it as unallocated in the Windows Disk Manager and see what Disk Utility has to say about it then....I doubt it will help but I really don't know. It's something to try.

 

Hopefully someone who has a better understanding of hard drive partitioning and UEFI/EFI/MBR sees this thread.



#8
ohmy

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For some reason Disk Utility won't even let me click on the partitions, not matter what, keeps bringing up that popup. But yes, you're right about it being UEFI mode, completely passed my mind. It seems Windows doesn't detect those partitions right either, I'm not too sure though, since they don't show up in My Computer or anything.



#9
Gringo Vermelho

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Don't worry about that. The other partitions don't show up in Windows for the simple reason that they don't have a drive letter assigned. I know that much. :)

 

So...you used an MBR patch to install OS X on a GUID partitioned drive....I guess that may have something to do with why it isn't working.

 

Sorry but I really have no idea about these things, I've avoided this kind of trouble on purpose since 2009 by using separate drives.

 

I'm moving your topic to multi booting/virtualization, hopefully that'll help.

 

Try to find out how people dual boot on a single UEFI/GUID drive.



#10
ohmy

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Well I have a little good news. By using the terminal command line in the installer I managed to use the diskutil command to format a partition to install, and then it all installed fine. However, I've yet to find a way to actually access the installation after that, bootloaders seem to throw up a kernel panic.

 

Thanks for your help so far though!



#11
ohmy

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Have I got any option for booting up this installed OS X then? It's definitely installed on that partition, but I've yet to access it. 







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