Why have my external hard drives suddenly stopped showing up in my computer?

[gmt3010]

I have Windows 10, 64 bit., professional.I have an HP notebook computerA few weeks ago my notebook stopped recognizing the external hard drives -- I have three of them, all WD exteral, between 1 and 3 TB. I use a few for back ups.All three stopped working at the same time so something changed in the settings, and I am at a loss as to what. This also happened about the time I noticed my notebook started freezing. Usually at night. My notebook is only 18 months old and pampered, so this should not be happening. It is an HP probook.I think it is in the settings, but am at a loss where to look. C

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