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Level 1

11 points

How to prevent Mountain Lion from going into sleep mode while creating image with disk utility?

Hi,

I have newly and succesfully installed Mountain Lion 10.8.1 on my Mac Pro mid 2010. As usually, as a second back-up option beside Time Machine, I would like to create a disk image of my Mac's hard disk on an external hard drive.

When I boot from the Mountain Lion install USB stick, start Disk Utility and follow the procedure to create a disk image, the process starts, but after 10-15 min the computer goes into sleep mode. I even set the time for going into sleep mode in ML's systems preference to "never", but to no avail, as this was setting was ignored when booting from the USB stick.

How can I prevent the machine from going into sleep mode this and finish creating the disk image? On older OS X versions the same procedure worked flawlessly.

Any suggestions are most welcome!

Thanks for your support,

Greetings from Germany,

Peter

Mac Pro, OS X Mountain Lion (10.8.1)

Posted on Aug 31, 2012 12:06 PM

18 replies

way9e0

Level 1

8 points

Mar 26, 2014 6:04 AM in response to SBeattie2

Thanks Scott.

I was referring to your commands as the elegant solution. However, given that I'd already started the image, I had to resort to the weight on the space bar.

I'm now on 10.9.2 so I will try to run an image soon and find out if the problem has been fixed.

Jul 27, 2015 11:45 AM in response to Pekett

I had my 2011 iMac go on the fritz immediately after doing the latest Yosemite update. In the process of trying to troubleshoot the problem, I discovered that I had shut off the backups back in February for some reason, so I can't really reformat yet. I got into disk utility and am making a disk image but the computer keeps going to sleep. Currently, I'm using the object on the spacebar. Thanks for the suggestion further down the thread, whoever suggested it!

Nyghtone

Level 1

4 points

Jul 30, 2016 7:28 AM in response to SBeattie2

Thank you for such a great solution.

How to prevent Mountain Lion from going into sleep mode while creating image with disk utility?