This is the signature feature. The tool performs a “Full Capacity Test” by writing data to every available block on the drive. If the drive reports it is 64GB but fails the test at 16GB, you know it’s a fake.
For the uninitiated, Mydisktest is a lightweight, portable Windows utility designed to validate and benchmark removable storage. Think of it as H2testw’s more detailed cousin. Version 2.42 isn’t brand new, but it’s the most stable build still widely recommended in forums for spotting counterfeit capacity drives (the dreaded 64GB that’s really an 8GB). Mydisktest V2.42
You select the target drive from the dropdown menu. This is the signature feature