Do I have to register external hard drives?

As I have already written, this should be automatically detected under any modern operating system.

On a record I had it that you were displayed in the disk management, but not in the Explorer under Windows!
Then deleted the partition, newly created, formatted and already it was displayed.
The plate was probably previously bought by an Apple user and was freshly formatted and then sent back.
For Windows, many foreign formats are Bohemian villages, then i.d.R. are displayed as unformatted and it is offered to format them.

What I already had, although this should be fully compatible, is that USB 2 HDDs were not recognized on USB 3 ports and vice versa.