Connected 2 4 t external hard drives

I have connected 2 external hard drives of 4 t to my Mac Mini he sees only one and he sees that 970 GB available on that one... .anybody know why in trouble?

How connected?

Where they envelopes business which included the HD?

What box/HD?

Are they powered by the USB bus? Or by an AC power brick?

-Does show in disk utility?

-Does show in System Profiler under USB? You should see the chipset in the enclosure, as well as the HD itself

OS X: about system information and System Profiler - Apple Support

https://support.Apple.com/en-us/HT203001

-Don't you format the disks?

Tags: Mac

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