I am using a USB connected "Sabrent FD-05PUB" 3.5" floppy drive to read data using Windows 10 computer. It shows in Device Manager as "TEAC USB UF000x USB Device" The 1.44MB disks read just fine. All 7.20KB floppies error with "A:\ is not accessible The disk media is not recognized. It may not be formatted." Any ideas?"
Some USB floppy drives don't support double-density floppy disks (as opposed to the newer high-density disks that are usually formatted to 1440KB). I think it's usually a limitation of the controller chip interfacing between USB and the drive itself.
You should try using a different drive, and look specifically for reviews of its performance on double-density disks.