F3 Alternatives
F3 is described as 'open source that assesses the real capacity of USB sticks and other media. An advantage over other tools is, that it does not need administrative rights to access the device' and is an app. There are five alternatives to F3 for Windows, Linux and Mac. The best alternative is H2testw, which is free. Other great apps like F3 are Quick Disk Test, Check Flash, USB Flash Drive Tester and CapacityTester.
Quick Disk Test fills a disk with test data and verifies that it can be read back without errors.
Check Flash is a tool for testing and formatting flash-drives. It can be used to clean eny evidence of activity on your flash drive by formatting it.With Check Flash you will be able to manage your flash drives by performing different maintenance tests on it.
Flash card/drive tester allows testing of any removable media including SD, MMC, CF, USB flash pen drives for bad or unstable sectors. Especially useful for testing for fake sizes often seen on low quality USB pen drives.
Tool to test a USB drive or memory card to find out if it's a fake. The tool performs a simple test to determine if the full capacity is usable or not. All it does is fill the volume with test data and verify if the data on the volume is correct.