8 Free Tools to Test Read and Write Speed of USB Flash Drives

5. 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.

check flash

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. The file will be limited to 4GB for FAT/FAT32. 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


6. Flash Drive/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.

flash drive card tester

The program is able to perform a read test, a destructive write test, or a combined read, write and compare test. As Flash Drive/Card Tester is a testing tool it will keep going until the entire drive has been tested. Therefore, we’d probably recommend stopping after five minutes or so to get a score. The result will show any recoverable or fatal read and write errors along with the final average speed.

Download Flash Drive/Card Tester


7. RMPrepUSB

RMPrepUSB is a tool we have mentioned several times before. It’s like a Swiss army knife for USB drives because it can do so many different things. One of those functions is performing a read and write speed test. Make sure to download the portable version of RMPrepUSB from the long list of downloads.

rmprepusb test speed

Run RMPrepUSB and select the USB drive from the top, then click the Test Speed button in the lower right. The included RMPartUSB.exe is called and runs the test by reading from and writing to a file of around 63MB in size. Because the test file is not that large it might give a slightly higher score than normal on faster USB drives. The results will be saved to a .CSV file where you can keep a record of drives and scores.

Download RMPrepUSB


8. File Read Test

This last tool is a little different from the rest because it only tests read speeds. It also needs data to be on the drive already because that’s what gets read back and where the result comes from. File Read Test is a Java based tool which means it’s cross platform but you also need to have Java installed.

To get a consistent sequential read score, copy a large file of at least a few hundred Megabytes to an empty drive. Run the program (right click and select Open with > Java(TM) Platform Binary) and either select a drive or manually select a file on the drive. One issue is the program seems to cache the results so to run the exact same test again you have to eject and reinsert the drive or the read speed will show up as being astronomically high.

Download File Read Test


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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