Alcor Micro Unknown Fa00 - F W Fa04 Jun 2026

Keywords used: Alcor Micro Unknown Fa00 - F W Fa04, Alcor Micro driver, FA04 firmware, USB flash drive bricked, Alcor MP Tool, fix unknown USB device.

The string "Fa00 - F W Fa04" refers to specific identifiers used by the hardware to communicate with the host system.

In Device Manager → right-click the device → Properties → Details → Hardware IDs. You’ll likely see something like USB\VID_058F&PID_FA00 (VID 058F = Alcor Micro).

Windows often caches bad drivers. Here is how to reset it: Alcor Micro Unknown Fa00 - F W Fa04

The internal software that manages data transfer between the USB interface and the flash memory has crashed or become corrupted.

On some modern laptops, particularly gaming laptops or ultrabooks, power management features in the BIOS can disable the card reader to save battery. If the device is in a low-power state or logically disconnected, Windows might detect the "shadow" of the device without being able to fully probe its identity, leading to an "Unknown" classification.

The drive may show "No Media," 0MB capacity, or be completely undetected by Windows Explorer despite being visible in Device Manager. Step-by-Step Repair Guide Keywords used: Alcor Micro Unknown Fa00 - F

This represents the internal code version currently running on the controller.

First, let’s decode the name. is a Taiwanese semiconductor company that specializes in USB hub controllers, card readers, and keyboard controllers. If you own a laptop with an integrated SD card reader, a multi-functional USB hub, or certain USB flash drives, you are likely using Alcor Micro silicon.

Common scenarios:

Before you initiate any repairs, . In most cases, the hardware is not broken; it is merely misconfigured.

Alcor Micro's official support site for various product lines can be found at Alcor Infotech Are you trying to fix a built-in card reader on a laptop, or are you trying to recover a USB thumb drive that won't open?

This error typically surfaces when the drive's firmware is corrupted or the controller has entered a "fail-safe" mode. On some modern laptops, particularly gaming laptops or