Thank you for that, oldskool.
Yes, I sincerely hope that someone is able to help me with this.
I've googled the problem and tried for quite a while to find a remedy for the problem, but my PC keeps on insisting to recognize my USB-converted IDE-drives simply as USB-devices. Which, of course, is pretty useless.
When the setup was working, the little icon in the right bottom corner of the screen - the "remove hardware safely" icon - reported them by letters (i.e. (H
, but now only as "mass storing device(s)" without any assigned letter(s).