Mydisktest V2.42 __top__

If the tool reports "mismatched capacity," your drive is fake. If you are struggling to even see the drive, you may need to check Windows Device Manager to ensure the port is active. The Dangers of Fake Drives

If the drive is a fake (e.g., a 1GB drive pretending to be 32GB), when the software writes to the 2GB mark, the drive's controller maps that write back to the 0GB mark (overwrite). When MyDiskTest reads the data back, it finds that the data at the 2GB mark does not match what was written, or that it has overwritten data stored at the 0GB mark. Mydisktest V2.42