![]() 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. ![]() 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).
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