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Old Jul 27, 2012, 01:17 PM   #1
Faux Carnival
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Join Date: Aug 2010
Restoring Macbook Air

Hi, I have Windows installed on my Macbook Air.

I would like to wipe clean everything and restore the computer to its factory settings. (Also remove Windows)

I booted in recovery mode. I choose my hard disk and when I choose 1 partition, it says

"Partition failed with the error:

Couldn't unmount disk."

What do I do now? Thanks.
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Old Jul 27, 2012, 01:22 PM   #2
littledude8209
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Join Date: Jun 2009
Quote:
Originally Posted by Faux Carnival View Post
Hi, I have Windows installed on my Macbook Air.

I would like to wipe clean everything and restore the computer to its factory settings. (Also remove Windows)

I booted in recovery mode. I choose my hard disk and when I choose 1 partition, it says

"Partition failed with the error:

Couldn't unmount disk."

What do I do now? Thanks.
This is because the recovery partition is a partition of your main disk. You need to boot from an external disk/usb to be able to completely erase your internal SSD. There are easy ways to make an external Mountain Lion USB. I attatched a link to show you how to do it. Hope that helps!

http://blog.gete.net/lion-diskmaker-us/
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13" Macbook Air (late 2010) 2.13Ghz, 4GB RAM, 256GB - iPhone 4 32GB - iPad 2 32GB (Wi-Fi + 3G)
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Old Jul 27, 2012, 01:29 PM   #3
Faux Carnival
Thread Starter
macrumors 6502a
 
Join Date: Aug 2010
Quote:
Originally Posted by littledude8209 View Post
This is because the recovery partition is a partition of your main disk. You need to boot from an external disk/usb to be able to completely erase your internal SSD. There are easy ways to make an external Mountain Lion USB. I attatched a link to show you how to do it. Hope that helps!

http://blog.gete.net/lion-diskmaker-us/
Thank you so much! Will I be able to completely format my HDD with this method?

And should I use Journaled when formatting?
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