M4 Mini doesn't see my GTech external HDD

Getting my M4 Mini all hooked up. I have 3 external HDDs - a Western Digital My Book that I use for Time Machine backups, an OWC RAID drive for my photo library, and a GTech RAID that I (normally) use for a separate backup of my photo library. The first two are working fine, but the GTech is not. I can't see it in the Finder, in Disk Utility, or in the OWC SoftRAID app. I was using the drive fine with my old iMac, and if I plug it into my work laptop (intel MacBookPro), it works fine. But, however I try to connect to my Mini, it doesn't show up anywhere. I have tried ports in the back, ports in the front, daisy-chaining it off my OWC drive, nothing. If I plug it into a front port on the Mini, I get a message that I need to connect a Thunderbolt device to a thunderbolt port, so it sort of sees the drive.

Interesting - I just tried plugging it into my M1 laptop, and was asked if I wanted to allow it to connect, when I said yes, it didn't anyway. So maybe apple silicon just doesn't like GTech drives? That will be VERY VERY disappointing, and expensive, I need to have backups.