2017 15" MacBook Pro Lacie External Harddrive connecting/disconnecting loop.

[vinyllabsf]

2017 15" MacBook Pro Touch Bar

OSX Mojave 10.14.3

Lacie Porsche External Hard Drive USB 3.0 5TB.

Lacie HD to USB 3.0 Highspeed Cable to Genuine Apple USB/USB-C adapter to Macbook Pro.

Working fine before and one day the external hard drive will not stay connected.

As soon as you plug it in it would immediately display Disk Not Ejected Properly.

Then it would reconnect, and disconnected again and again and again. Until I unplug the USB cord.

HD is partitioned and has a designated drive for TM.

Another possible related issue is my external monitor (LG 38UC99) will randomly disconnect on Bootcamp (Windows 10 Pro) side only.

I suspect the USB-C ports are not supplying enough power or losing connection.

I have tried all 4 ports and it happens the same on each port.

I have also swapped out the USB cable 3 times and still the same.

I thought maybe the external hard drive was going bad, but when I connected it to my 2015 MacBook Pro Retina it works fine.

Please help if you have a solution.

Thanks in advance.

 

[Trey M]

It’s possible that the drive has corrupted all of your USB-C ports. I had this exact same issue with my 2017 MBP and a Lacie External drive (2TB). It suddenly stopped working one day and I also started having weird issues with my USB-C ports. Apple had to end up replacing my machine entirely
after failing to repair in a timely fashion due to a constrained part.

I took my Lacie drive to a Microcenter to see if they could open the drive up and try to recover the data on it. They plugged it into a Mac onsite, and it ended up corrupting that computer as well. The guy showed me the drive and how it appeared to be fried, and I was also able to smell something burnt on the drive itself after corrupting the Mac at Microcenter. I left there with no recovered data and they were unable to get their Mac to power back on after testing out the drive. I’d recommend a Genius Bar visit to test your ports, usually the repair to just replace ports is fairly simple.