: The internal physical circuit board has broken traces or a shorted capacitor separating the logic gate from the storage. Step 1: Diagnose the Drive in Disk Management
Before attempting to fix or format the drive, you should attempt to rescue any critical files. Because the drive shows up as "Full" or unallocated, standard file browsing will not work. Method 1: Use Advanced Data Recovery Software usb mass storage devicenand usb2disk full