F3

f3: Fight Flash Fraud with Storage Verification Tools

f3, short for Fight Flash Fraud, is a powerful command-line utility designed to detect counterfeit flash storage devices. These devices often report a higher capacity than they actually have, leading to data corruption and loss when users exceed the real storage limit. f3 performs thorough read and write tests to verify the true capacity and reliability of USB drives, SD cards, and other flash media, ensuring you get what you pay for and protecting your data from fraudulent devices.

The tool suite includes f3read and f3write for full testing, f3probe for quick capacity checks, and f3fix to correct reporting errors on fake drives. Its open-source nature and availability on multiple platforms make it an accessible solution for consumers and professionals alike who want to ensure the integrity of their storage hardware.

f3 Quick Start: First Steps

To begin using f3, download and compile the source code for your operating system (Linux, macOS, Windows via Cygwin). Once installed, you can start by using f3probe /dev/sdX (replace /dev/sdX with your device) for a rapid capacity check. For a comprehensive test, run f3write --device /dev/sdX followed by f3read --device /dev/sdX to write and then read data across the entire reported capacity of the drive.

If f3 detects a fake drive, it will report the actual usable capacity. For drives that incorrectly report their size, f3fix can be used to reset the device's reported capacity to its true value, making it usable up to its actual limit.

Core Functions and Tools in f3

1. f3write: Writes zeros to the entire device to test its reported capacity.
2. f3read: Reads from the entire device to verify data integrity and report errors.
3. f3probe: Performs a fast scan to estimate the true capacity of the drive.
4. f3fix: Resets the device's reported capacity to its actual, usable size.
5. Full Testing Cycle: Combines write and read operations for definitive verification.

Ideal Use Cases for f3

• Verifying the actual capacity of newly purchased USB drives.
• Testing SD cards before using them for critical data storage.
• Identifying counterfeit or modified storage devices.
• Ensuring data integrity and preventing corruption on flash media.
• Confirming the performance and reliability of storage devices.
• Protecting against scams involving fake storage capacities.

Contact and Support Options for f3

Information regarding contributions, bug reports, and licensing can be found in the "Contribute" section of the f3 documentation. For direct inquiries or support, please refer to the project's repository or community resources. Specific contact emails are not publicly listed on the main documentation page.