is a popular free diagnostic tool designed specifically for testing USB flash drives, SD cards, and other portable storage media. It is widely used for identifying "fake" drives that report a higher capacity than they actually have. Key Functions
Measures the actual read and write speeds to ensure they match the manufacturer's claims. mydisktest v242
Warning: This will erase all data on the drive. Back up everything first. MyDiskTest v2
Measures real-world read and write speeds to ensure they meet the manufacturer's claims. Run tests on raw block devices (when safe)