I've downloaded Mac OS X Mountain Lion today and wanted to backup the installation image to a USB drive for later.
I've created a new empty partition of at least 8 GB size on the external drive using Disk Utility, and tried to restore the InstallESD.dmg image to this new partition, via the Restore menu.
However, doing that, I get the following error message, right after it finishes copying:
Cannot Allocate Memory
What can I do now?
Best Answer
This works:
Got it from Apple Support directly