The most reliable method is the "drag and drop" test. Fill the drive to capacity with a large number of video files (e.g., .mkv or .mp4 ). Once it is "full," try to play the files you saved first (the oldest files on the drive). If they have become corrupted or are inaccessible, your drive is likely a fake.
When an SSD’s firmware corrupts due to a sudden power loss, the drive often becomes undetectable. The Sdata Tool 64GB can force the drive into "safe mode" via a jumper or special ATA command, then re-flash a known-good firmware from its internal 64GB library. This recovers data that would otherwise require a cleanroom. Sdata Tool 64gb
What are you currently using (e.g., Windows 11, macOS, Linux)? The most reliable method is the "drag and drop" test