6 Tools to Test Read and Write Speed of USB Flash Drives

4. Check Flash

Check Flash

The main function of Check Flash is to scan a USB flash drive for possible errors, but it also runs a read and write speed test while doing so. In addition, using the more advanced logical or physical Access types allows flash drive erasing, backup and restore and also partition editing. The “Use temporary file” method is non destructive and will fill all the remaining space on the drive with a temporary file and then perform an error check on it while recording the read and write speeds. Because all the available space is utilized, this test could take a while on empty larger flash drives. Check Flash is portable and also has some command line options in Switches.txt.

Download Check Flash

5. CrystalDiskMark


CrystalDiskMark is a good all round tool for testing the performance of hard drives, SSD drives and also USB flash drives. It’s also the tool we used to test RAM disks for their read and write speeds. For testing USB flash drives we recommend dropping the default test size to 50MB or 100MB and maybe the number of passes to 1 or maybe 2, then it won’t take so long to complete the test. After selecting the USB drive from the drop down list, you can run all 4 tests by clicking All or select a Sequential, 512K, 4K or 4K QD32 (which isn’t really needed for USB) test to run individually. Portable and installer multilingual versions are available.

Download CrystalDiskMark

6. Flash Drive/Card Tester

Flash Drive or Card Tester

Flash Drive/Card Tester is more of a tool to check your removable USB flash drives, Compact Flash cards or SD cards etc for read and write errors, but also shows the speed of the drive while it’s being tested. It’s the only tool here that specifically needs installation and is able to perform a read test, a destructive write test, or a combined read, write and compare test. The result will show any recoverable or fatal read and write errors along with the final average speed.

Download Flash Drive/Card Tester

Note: Although these tools are either designed specifically for testing USB flash drives, or good at at it, there are many other programs around to test the performance of hard disk drives and SSD drives that can also measure USB flash drive speeds. These include HD Tune, ATTO Disk Benchmark, Disk Throughput Tester, AS SSD and etc.

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