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 1440 KiB disks read just fine. All 720 KiB floppies error with:
A:\ is not accessible
The disk media is not recognized. It may not be formatted.