While holding the short, plug the drive into your computer's USB port.
Set this option to Natural or Capacity Optimize to restore the maximum possible storage space.
: This indicates the current, locked safe-mode firmware status. It prevents Windows from writing or reading data to protect the remaining physical components.
The table below outlines why this happens and how specialized technicians and forum communities (like the Alcor Micro section on USBDev ) address it. Technical Explanation Resolution / "Fix"
When a flash drive is plugged in, its micro-controller acts as a bridge, reading a unique Flash ID (FID) from the memory chip. If the controller crashes, encounters a severe bad-block cluster, or runs mismatched internal firmware (like F/W FA04), it drops into a fail-safe or "Test Mode". alcor micro unknown fa00 f w fa04 fixed
Navigate to the Mode tab and verify that Fixed Disk or Pure Disk is checked. 4. Execute the Flash
You can fix this by using the to reflash the correct firmware (FW) and reset the controller. 🛠️ Prerequisites A Windows PC: These tools do not run on macOS or Linux.
The identifier alcor micro unknown fa00 f w fa04 fixed is a beacon for repair, not a dead end. It reveals that you are dealing with an Alcor Micro AU6989-series controller running FA04 firmware. While generic tools may fail with an 30400 Unknown flash error , the correct AlcorMP tool—especially the _MD versions—can bring the drive back to full functionality.
The specific version that matches your controller (e.g., AU6989SN-GT). 📝 Step-by-Step Fix 1. Identify Your Hardware While holding the short, plug the drive into
When this occurs, the drive may appear as "Generic USB Hub," "Unknown Device," or show "No Media" in Disk Management. Phase 1: Identifying Your Hardware
The controller cannot talk to the physical flash memory pins.
Look for chips like AU6989SN-TA , AU6989NL , or similar variants.
A fix (driver patch or EEPROM rewrite) changes behavior to: It prevents Windows from writing or reading data
To fix a problem, you must understand it. Let’s break down the term word by word.
: When the tool successfully initializes the NAND and flashes the firmware, the "FA04" status represents a successful "Write Configuration" phase. This means the controller has successfully partitioned the flash memory and established a new file allocation table. Conclusion
Locate the drive, right-click the empty space, and select .