Alcor Recovery Tool (often referred to as the AlcorMP or Alcor Micro Production Tool) is a specialized low-level utility designed to repair, format, and restore USB flash drives equipped with Alcor Micro controllers

Copy a large file (e.g., a 500MB video) to the drive. Eject it properly, reconnect, and verify the file integrity. Run chkdsk /f X: (where X is your drive letter) for extra confidence.