I have 3 external hard drives attached directly to the rear USB 3.0 ports and one USB 2.0 hub with 2 hard drives attached. About once a week one the directly connected hard drives disappears. I have to pull out and reinsert the USB cable and the hard drive comes back. It has happened on two of my hard drives - Fantom drive and a Seagate drive. Any help. I did uncheck the " put to sleep" to save energy.
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