This is the core reason to use MyDiskTest. Unlike standard formatting, the expansion test writes data to every sector of the drive and then reads it back.
Unless you have a specific legacy need and can verify the file signature, it is safer to use H2testw for capacity verification. mydisktest v242
Identifies the exact physical storage limit of any flash media. This is the core reason to use MyDiskTest
Identifying "black chips" or inferior flash memory used in the drive. mydisktest v242