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When I plug my external 3.5" hard drive into my 13" 2016 MacBook Pro, the Trackpad becomes very erratic and difficult to use. The drive is housed in a powered enclosure (brand Integral). Other external drives don't do this (2.5" without external power). Otherwise the MacBook functions normally, Bluetooth mouse works fine, the keyboard works fine.

I suspect this has something to do with the drive being powered externally. What could be causing this? And is it dangerous for the computer (or me)?

Edit: the drive won't mount when the MacBook is connected to external power. If I plug in the MacBook, the drive immediately ejects.

  • What is the make and model of your MacBook Pro? – Nimesh Neema Jun 1 at 20:38
  • Hi, it's a 13-inch 2016. – user4987992 Jun 1 at 20:57
  • Hello, and welcome to ask different. Does this problem persist when booted into safe mode (booting whole holding down the shift key)? – Sam Jun 1 at 22:08
  • not sure about safe mode, i'll try it at next reboot – user4987992 Jun 2 at 13:36

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