Windows 10 won't boot when external USB drive plugged in

By Selwyn Polit, 25 August, 2021

I recently purchased a cool new 4 TB external WD hard drive for backups.  When I plugged it in and rebooted my computer, I got a black screen and never saw windows boot up. I spent some time looking at various posts but never found anything useful so I thought I'd post my solution here.

Note.  the drive worked fine when I plugged it in.  I only found a problem when I rebooted the computer.  This is a problem as I plan to leave the drive plugged in so my system can make a daily backup each evening to the external drive.

It appears that the drive was formatted using the exFAT File system.  This was the culprit.  As soon as I reformatted it with NTFS, all was good.  You can see from the format option below where I selected NTFS on a 1 TB drive I have installed in my computer.  I hope this helps someone save some time.