Use HDD Low Level Format Tool . Select your USB → Click "Low-Level Format" → Choose "Fill with zeros." This takes 20-60 minutes for a 32GB drive.
The drives were infected with a RansomUSB variant. It didn't encrypt files; it altered the USB's SCSI Pass-Through Direct command set, tricking the OS into thinking the controller had a hardware switch enabled. removable usb disk repair malvastyle solutions
Open Terminal. Type:
sudo dd if=/dev/zero of=/dev/sdb bs=1M status=progress (Replace /dev/sdb with your actual USB device. Be extremely careful!) Use HDD Low Level Format Tool