The string is not a virus, not a conspiracy, and certainly not a sign that your PC is broken. It is simply a legacy USB controller chip caught between functional fallback mode and missing driver support.
The connection between the controller (like an AU6989SN-TA) and the NAND flash is broken.
: Many generic drives reporting "Unknown [FA00]" are counterfeit. For example, a drive sold as 64GB might only contain an 8GB memory chip. After using AlcorMP, the drive will revert to its true physical capacity .
Standard Windows tools cannot repair corrupted controller firmware. You must evaluate the hardware using specialized low-level utilities. alcor micro unknown fa00 f w fa04 top
(or AU6989SNCS-TA) USB controller. This specific firmware string usually appears in diagnostic tools like ChipGenius or AlcorMP when a flash drive is corrupted, showing "No Media" or "0 Bytes". Understanding the Codes : This is the controller ID, often linked to the AU6989SN-TA : Refers to the current firmware version (FA04) flashed onto the controller. Unknown / No FID
Let's break the keyword into its core components.
To fix a drive showing this status, users often turn to "Mass Production Tools" (MPTools), which are used by manufacturers to flash initial firmware. The string is not a virus, not a
The manufacturer of the USB microcontroller chip managing data transfers between your PC and the NAND flash storage cells.
The string is not a standard product name. It is a composite of data your operating system pulled from the device’s firmware—specifically from the USB Device Descriptor . The system sees a vendor ID (VID) or chip ID that maps back to Alcor, but the specific function is missing from Windows’ built-in driver database.
Search for "Alcor Micro USB 2.0 Card Reader Driver FA00" – look for a ZIP file containing alcorusb.inf and alcorusb.sys . Reliable sources include: : Many generic drives reporting "Unknown [FA00]" are
: The diagnostic software recognizes the manufacturer signature but cannot map the internal controller ID to a known chip model (such as the AU6989 or AU7648B).
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