Help? the source volume is read-write and can not be disassembled...

I use 10.11.5 on an iMac 21.5 ", end of 2009 and I want to restore the OS X 10.11.5 to HD on an external drive but I get this message" Source volume is read = write and cannot be disassembled, so it cannot be copied from block. "  I can find answers do not address El Capitan.  Help would be greatly appreciated.

.. .Goldie

You use disk utility's restore feature?

If the HD has a recovery partition, you can make starting in place of the recovery.

Or you can use SuperDuper! (the basic version is free and can copy the entire disk, the paid version allows "smart updates", which copies only files that are different, saving time) running on externally to perform the copy.

Tags: Mac OS & System Software

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