f3 ☆

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Description:
Test various flash cards

Type: Formula | Latest Version: 9.0@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: flash-memory storage verification cli hardware-testing

Install: brew install f3

About:
F3 (Fight Flash Fraud) is a command-line utility designed to detect and verify the true capacity of flash memory cards and USB drives. It works by writing test data to the storage device and then reading it back to identify counterfeit drives that report inflated capacities. This tool helps users avoid data loss and ensures the integrity of their storage media.

Key Features:

Verifies actual storage capacity against advertised size
Reads and writes test patterns to detect errors
Provides clear, simple command-line interface
Supports both writing and reading phases separately

Use Cases:

Validating new flash drives before use to prevent data loss
Testing used memory cards for integrity and true capacity
Identifying counterfeit or faulty storage devices

Alternatives:

h2testw – Windows-only GUI tool with similar functionality
badblocks – Linux utility for scanning storage devices for bad sectors

License: GPL-3.0-only

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, sonoma, ventura, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 2:45pm		0	VERSION_BUMP	4c98afe8