Normally, your computer identifies the drive by its brand name (like SanDisk or Kingston). However, "NAND USB2DISK" is often a generic identifier used by the operating system when the controller cannot properly read the specific firmware or the NAND memory chips. It is essentially the device’s "emergency" or "fallback" name. Why Does This Happen? Corrupted Firmware
If a partition exists but lacks a letter, right-click the block and select . nand usb2disk usb device driver exclusive