When a USB flash drive becomes corrupted, shows a "Write Protected" error, or reports 0 bytes of capacity, it is rarely a hardware failure. Most often, the firmware on the flash memory controller has crashed.
What does Windows show when you plug in the drive?
USB flash drives are convenient but prone to corruption. When a drive becomes write-protected, shows zero bytes, or fails to register in Windows, standard formatting tools will not work. Repairing these devices requires low-level factory software. For flash drives built on the FirstChip FC1178BC controller, the definitive solution is .
Note: The tool may appear to freeze or become unresponsive. This is normal, as low-level scanning can take a long time—often 1 to 2 hours or more, depending on the capacity of your drive. Do not unplug the drive or close the tool during this process. firstchip fc1178bc mptools 2022
A short USB 2.0 cable (USB 3.0 cables introduce signal noise during low-level repair). A paperclip or tweezers to short the flash drive's test points.
: Fixes drives that are detected by Windows but show no storage space or cannot be formatted.
Connect the Drive: Plug your USB drive into a motherboard port (avoid front-panel hubs for better stability). When a USB flash drive becomes corrupted, shows
: A 64GB drive suddenly shows up as 8MB or 0 bytes.
Download a hardware diagnostic tool like or Flash Drive Information Extractor .
Write-Protect Errors: If the drive is stuck in read-only mode, the MPTools can usually bypass this by performing a factory reset of the controller's flags. USB flash drives are convenient but prone to corruption
Windows detects the drive but shows "0 Bytes" total space.
In the world of flash drive controllers, the holds a controversial yet essential spot. Found in countless budget USB 3.0 drives from brands like PNY, Kingston DataTraveler (specific revisions), and generic “no-name” Chinese flash drives, this controller is responsible for storing billions of files. However, its partnership with low-quality TLC or QLC NAND flash means failure rates are high.