H2testw
H2testw is a free utility for testing the true capacity of USB flash drives. It can detect fake drive capacities and bad sectors to ensure your drive is reliable.
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H2testw: Test Your USB Flash Drive Capacitys
Free utility for testing true capacity of USB flash drives, detects fake capacities and bad sectors for reliability
What is H2testw?
H2testw is a free and open-source utility used for testing USB flash drives to make sure they match their advertised drive capacity. It was created by German software developer Harald Bögeholz.
The utility works by writing test data across the entire drive and then reading it back to check for errors. It will detect issues like:
- Fake drive capacities that are misreported as larger than the actual size
- Damaged or corrupted flash memory cells
- Read/write errors and bad sectors
If any issues are found, H2testw can calculate the real size of the drive minus problematic areas. It generates a log file showing detailed info about the test results.
Running H2testw provides peace of mind that your USB flash drive matches its specified capacity and is free from errors or hardware defects before you rely on it to store important data.
The utility has a simple graphical user interface, runs portably from a USB drive without installing, and is offered in both English and German languages. It works on Windows PCs.
H2testw Features
Features
- Tests integrity of USB flash drives
- Detects fake drive capacities
- Detects bad sectors
- Measures real capacity of drive
- Writes test files and verifies them
Pricing
- Free
Pros
Free and open source
Easy to use
Reliable at detecting fake/faulty drives
Works on Windows and Linux
Cons
Destructive test erases data
No support for other drive types besides USB flash
Very technical interface
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