the disk appear to have been partitioned by another utility and cannot be erased

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the disk appear to have been partitioned by another utility and cannot be erased

I have a MBP with 2 SSD's. Yosemite is running on the 1TB SSD which has been partitioned to a 150 / 850Gb volumes.

I wanted to install Windows 10 using Boot Camp but after succesfully downloading Windows support software I can't proceed in the next step where I have to choose a volume (Pluto). Boot Camp Assistant shows my SSD and when I chose that the following warning appears:

"the disk appear to have been partitioned by another utility and cannot be erased"

I see that Pluto doesn't have GUID and this may be the problem but there are allready some data on the 850 Gb volume that I don't want to erase. Is there a way to fix this without destroying the data? I don't even know why Pluto does not have GUID in the first place..

Thnx,

G

MacBook Pro, OS X Yosemite (10.10.4), Late 2011-500GB+1TB SSD's-16 Gb RAM

Posted on Dec 11, 2015 3:30 PM

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Answer 1

Loner T

Level 9

59,536 points

Dec 11, 2015 4:38 PM in response to Mobie67

You have two "Pluto" entries. The outermost is a CoreStorage Volume Group, which has two volumes, one is named Pluto, the other is TerraNova. The 512 Gb Samsung is your second physical disk. The Pluto in the BC Assistant is the full LVG, not just the Pluto volume, which also contains Terra Nova.

BCA does not support such a configuration on your MBP. You will need to backup your Data, or manually partition the disk and do some terminal work, if you want to install Windows in this configuration. The second SSD will complicate it further. You may have to physically remove the non-Windows disk to be able to install Windows.

Your Late 2011 Mac does not support Windows 10 as documented in Use Windows 10 on your Mac with Boot Camp - Apple Support . You will run into driver issues.

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Answer 2

Mobie67 Author

Level 1

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Dec 11, 2015 4:44 PM in response to Loner T

So if I understand correctly Boot Camp only installs on LVG?

I'll go and try virtualisation then - too noob for the terminal workaround and try with earlier Windows version.

Thnx Loner!

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Answer 3

Loner T

Level 9

59,536 points

Dec 11, 2015 5:24 PM in response to Mobie67

Mobie67 wrote:

So if I understand correctly Boot Camp only installs on LVG?

Bootcamp can handle LVGs on a single disk. Your second disk complicates the BCA handling. BCA will want to erase the disk which is not your boot disk in the current configuration.

I'll go and try virtualisation then - too noob for the terminal workaround and try with earlier Windows version.

Definitely an option.

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