: If your drive suddenly identifies as "NAND USB2DISK" instead of its brand name (e.g., SanDisk), the internal controller has likely lost its ability to communicate with the NAND memory chips. This is frequently unfixable. Troubleshooting & Fixes
Only download a driver from third-party sites if you have identified the exact controller chip and are obtaining official tools from the chip manufacturer. Otherwise, let Windows handle the driver automatically. Your system will remain safer, and you’ll avoid the clutter of unnecessary driver software.
: In Disk Management , right-click the drive and select Change Drive Letter and Paths to ensure it has a valid letter assigned.