Drive external hard (connected to the Mac mini USB) disconnect during use

I have a 3 TB (WD green) hard drive in an external hard drive enclosure "miniStack MAX Media", connected to my Late 2012 Mac mini via USB.

I don't know when he started to do this, but I recently noticed that it was dismantling even when she was in use; the error was:

Disc eject does not correctly
EJECT 3 ' TB' before you unplug or turn off.

I replaced the USB cable and saw the same mistakes.

I moved the HARD drive to a different box. same mistakes.

I swapped the HARD drive to a whole new WD 4TB blue; same mistakes.

So now I have a new drive in a new case with a new cable, and I see the same messages "Disk not ejected correctly".

(By the way the disk utility has shown that the two discs were fine when I ran first aid.)

This brings me to assume that the problem is with my Mac mini, which runs at El Capitan and is fully aware of the updates of the operating system.

Recommendations on next steps to investigate and resolve this problem?

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It seems that your external draws too much power. That shows the report of your system? You have an external power supply for external drive? Have you tried to use all the USB ports on your Mac?

Tags: Mac

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