Capacity Tester
A simple tool that attempts to determine if a drive is a fake or not.
Description
Use CapacityTester to check if your USB thumb/flash drive lies about
its capacity. Graphical tool to detect fake USB drives.
- Test your new USB flash drive from China to find out if its full capacity can be used or if it's fake!
- The volume test fills the filesystem, verifying that all of it can be used. It's slow, it takes hours.
- The disk test overwrites the drive itself and is much faster (some GB/TB large USB drives can be checked in less than 10 minutes); but it's somewhat experimental.
Version
v0.7Dec 29, 2025