Do not trust File Explorer alone.
The error message "USB Mass Storage Device NAND USB2Disk Full" usb mass storage devicenand usb2disk full
Power surges or physical wear and tear have permanently damaged the connection between the controller and the memory. Phase 1: Crucial Data Recovery Steps Do not trust File Explorer alone
To fix the drive, it helps to understand what the error message actually means: usb mass storage devicenand usb2disk full
How to Fix the "USB Mass Storage Device NAND USB2DISK Full" Error