I solved this problem in 7.1.4, and now, after updating to 7.2.2 I am having the same problem again, but just with one HDD. LOOK: https://ibb.co/JR64QFQM I did this in 7.1.4., but now it is generating problem with one hdd: I ran lsusb and confirmed that both of my USB enclosures report the same chipset and USB ID: 2109:0715 (VIA Labs, Inc. VL817 SATA Adaptor). So it looks like both enclosures share this VID:PID. I’ll go into the Syslinux Configuration in Unraid (Main > Flash > Syslinux Configuration) and modify the append line to: append initrd=/bzroot usb_storage.quirks=2109:0715:u, then save and reboot.