Good news: The device `/dev/sdb' is the real thing WARNING: Probing normally takes from a few seconds to 15 minutes, but This is free software see the source for copying conditions. Check Real Size of USB Flash DriveĬheck the real size of the USB flash drive: $ sudo f3probe -destructive -time-ops /dev/sdbĬopyright (C) 2010 Digirati Internet LTDA. In the example above, sdb device name corresponds to my 32GB USB Flash Drive and mmcblk0 is a 32GB Micro SD Card. List block devices and search for the name of the device you want to test: $ lsblk Insert the USB thumb drive or SD card which real size you want to find out. Install f3 ( Fight Fake Flash), a simple tool that tests capacity and performance of USB flash drives and SD cards:
In this note i will show how to find out the actual size of USB flash drives and SD cards, how to fix drives with fake capacity and how to measure the real READ/WRITE performance.Ĭool Tip: Test performance of HDD, SSD, USB Flash Drive, SD card! Read more → Fake Flash Test Linux and MacOS users can do this from the command line using the f3 – a set of tools for testing for fake USB flash drives and SD cards by measuring their real capacity and READ/WRITE speed. The second is Test Empty Space this one writes test files to the remaining free space on your drive - this test is not destructive, but if you do have a fake, then you could lose your data.įakeFlashTest is designed to perform a quick check to verify if a flash memory device is fake (i.e., they have been programmed to lie about their size) it does not check all memory faults.Once a USB flash drive or an SD card is purchased, it is a good idea to check if the announced capacity of a device is real or fake (as a system may show a wrong size). The first is the Quick Size Test it will check your drive and report the actual capacity and warn if the drive is fake - this test is destructive and the author states that you WILL lose files. But that is not all it can help prevent corruption for example, a 32 GB SD card may only have 4 GB of memory, and once you fill that 4 GB space, it can potentially become corrupted, resulting in a loss of all the data stored.įakeFlashTest includes two tests, and due to the nature of these tests, we strongly recommend backing up all data stored in the test subjects. This is a pretty slick and simple tool for verifying that you have the memory size you paid for. FakeFlashTest is for testing the actual memory size of USB Flash Drives and SD cards.
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