If you’ve landed on this page, chances are you are staring at a cryptic entry in your Windows Device Manager. You see a yellow exclamation mark next to an "Unknown Device," and upon digging into the properties, you are met with a string of code that looks like it belongs in a sci-fi movie: .
is a significant designer and manufacturer of USB controller chips, widely used in various USB storage devices, including flash drives and memory card readers. The "FA00" or "FA04" reference usually signifies a specific firmware revision within the Alcor AU6989SN or AU6998 series.
Identify the larger rectangular chip (the NAND flash), not the smaller square Alcor controller chip.
When Windows displays an "Unknown Device" or "Mass Storage Device" with a faulty driver, it means the operating system recognizes a device is plugged in but cannot communicate with its flash memory, often resulting in: alcor micro unknown fa00 fw fa04 hot
If you're dealing with a flash drive that isn't working properly, the most common solution is to use "low-level formatting" or "mass production" tools. This process, often called "repairing" or "recovering" a flash drive, involves writing a fresh set of low-level instructions (the firmware) to the controller.
To fix or diagnose the drive, it helps to understand what is happening under the plastic casing. The failure typically stems from one of three distinct root causes:
Insert your hot USB drive into the port and immediately click . Step 4: Configure the MPTool Flash Settings If you’ve landed on this page, chances are
A: It can be. Over time, consistent high heat can damage the delicate electronic components inside the device itself. In rare cases, a short circuit caused by a failing, overheating device could potentially damage the USB port or motherboard on your computer, though this is uncommon.
Enter the Vendor ID (VID) and Product ID (PID) of your device (Default Alcor values are typically 058F and 1234 ). Click and choose Save InstallDrive .
Sometimes, a Windows Update or a driver cleaner utility removes the generic WUDFRd.sys (Windows User Mode Driver Framework) or the legacy USBSTOR.SYS files. The card reader is physically fine, but the software link is broken. The "FA00" or "FA04" reference usually signifies a
to find your specific controller part number (e.g., AU6989SN-GT) and the Flash ID (FID). Download Compatible MPTool
Once you have confirmed that you are dealing with an Alcor Micro controller in a failed state ( FA00 ), the standard formatting tools in Windows, Linux, or macOS will almost certainly fail. They cannot repair firmware-level issues.