Besides FakeFlashTest, there are other programs that help you determine whether or not a flash drive is authentic such as H2Testw and Flash Drive/Card Tester are some of the easiest tests to use.

Only if the drive is bogus will the program automatically delete your data. The Text Empty Space test is the second, and it writes test files to the free space on your hard drive. It’s suggested that you backup all of your files before you begin checking. The Quick Size Test may delete your files and cause you to lose your data. The test will determine the drive's true size, report its ability, and determine if it is genuine. There are two checks in the FakeFlashTest tool.

To use FreeFlashTest, plug the flash drive into your computer's USB port, run FakeFlashTest, and choose 'Test Empty Space.' This will take some time, but you will be provided with information about the actual storage capacity of your Flash drive. FakeFlashTest runs a USB memory test and informs you of the Flash drive and SD card’s real storage capacity.

Fakeflashtest mac