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Internal SATA disk unmounting during clone

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"Asus Sabertooth x58"  running Mac OS Sierra with latest (4184) Clover bootloader following instructions here:


Most everything important works, but I'm running into a problem when attempting to clone my startup disk using either disk utility or SuperDuper (they use the same underlying method anyway). Drives are internal SATA III SSD and correctly show on desktop with internal drive icons. The target disk keeps unmounting itself during the copy and I get the "disk not ejected properly" message. 

I've tried:

- turning off "put disks to sleep" in energy saver settings

- disabling spotlight on all disks, as some reported that as the problem

...but neither helps here. Any suggestions?

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