Top [updated] — Alcor Micro Unknown Fa00 F W Fa04
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. Chapter 2: Deconstructing the Code – What Does "FA00 F W FA04 Top" Mean? Let's break the keyword into its core components.
Introduction: The Plug-and-Play Mystery In the world of PC hardware troubleshooting, few messages inspire as much confusion as the dreaded "Unknown Device" in Windows Device Manager. Among the most cryptic of these identifiers is a specific string associated with Alcor Micro Corp.: "alcor micro unknown fa00 f w fa04 top" . alcor micro unknown fa00 f w fa04 top
If you have landed on this page, you likely have just plugged in a USB device—a card reader, a budget SSD enclosure, a fingerprint scanner, or even a cheap USB hub—only to find that your computer recognizes something is there, but has absolutely no idea what to do with it. The string is not a standard product name
: You are likely dealing with an Alcor Micro USB 2.0 Multi-Card Reader (supporting SD, MMC, and possibly MS or xD cards) that has entered a low-level or fallback mode. Alternatively, it could be a firmware-bricked device showing a bootloader interface instead of a functional reader. Chapter 3: Why Does Windows Show "Unknown" for This Device? A healthy USB device identifies itself with a VID (Vendor ID) and PID (Product ID). For example, Alcor’s official VID is often 058F . If Windows sees 058F:FA00 , it looks for a driver. If none exists, you get the "Unknown" status. Chapter 2: Deconstructing the Code – What Does
This article will leave no stone unturned. We will dissect what Alcor Micro is, what the codes FA00 , F , W , FA04 , and TOP signify, why this device remains "unknown," and the step-by-step methods to force it to work. Before solving the error, we must understand the manufacturer. Alcor Micro Corp. is a Taiwanese semiconductor company founded in 1989. While names like Intel, AMD, or Nvidia dominate headlines, Alcor Micro works in the trenches of peripherals.
| Component | Likely Meaning | | :--- | :--- | | | The manufacturer of the USB controller chip. | | unknown | Windows has no matching .inf driver file for the PID (Product ID). | | FA00 | The Product ID (PID) or internal chip revision number. Often indicates an older or generic Alcor chip, possibly the AU6370 , AU9360 , or a multi-format card reader controller . | | F | Likely a firmware revision or boot mode indicator. "F" might stand for "Flash" or "Factory". | | W | Could denote Windows driver mode , or in some contexts, Wide bus (for card reader interfaces). | | FA04 | A sub-identifier or internal register value . This is often the bridge chip’s secondary function code. In some Alcor documents, FA04 points to an MMC/SD card interface protocol. | | TOP | This is intriguing. "TOP" might refer to a top-loading card slot (physical design) or a top-boot firmware layout. In engineering samples, "TOP" sometimes distinguishes a device from a "BOT" (bottom) model with different pinouts. |
