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

Whenever you buy a new piece of computer hardware, whether it’s a CPU, memory, hard drive etc, one of the factors that will help to determine your purchasing decision would be the performance of the component. With hard drives and SSD drives, you will be looking at capacity and read/write speeds, and it’s a similar story when you purchase a removable memory card or USB flash drive.

Apart from having to worry about USB drives being the full capacity and not being fake if you buy from somewhere like eBay, the performance of a flash drive can vary by massive amounts depending on manufacturer and the type of memory used. If you buy a slow USB flash drive with a high capacity, it could literally take hours to fill it up completely.

But if you already have some USB flash drives in hand, do you know how fast they actually are at reading and writing? A drive that only writes at 5-6MB/s could take a while to copy large files like movies, whereas a fast USB3 flash drive could do the same copying tasks much faster. Here’s a selection of 8 free tools to benchmark your USB flash drives or media cards to give you an idea of how fast they are.

1. USBDeview

USBDeview is a portable utility by Nirsoft that lists or allows you to uninstall current and any previous USB devices attached to your computer. Another feature is the option to benchmark a flash drive and optionally publish the results to the Nirsoft Speed Tests webpage for viewing and comparison. One of the good things about USBDeview is it’s still actively supported and updated.

nirsoft usbdeview

Find your USB device which should be highlighted in green with a device type of “Mass Storage”, right click on it and select Speed Test (Ctrl+T). Click Start Test and it will sequentially read and write a 100MB file to get the scores. Then you can choose to publish the test results if you wish by clicking the button and ticking the box to agree to publish the results.

Download USBDeview


2. SpeedOut

SpeedOut is a small, simple and portable tool that can quickly measure the sequential read and write speed of your flash drive. The program runs the tests at a low level (needs to be run as admin) which means the scores aren’t affected by the drive file system.

speedout benchmark

Simply choose your USB drive from the drop down if you have more than one, and SpeedOut will run 4 passes for both reading and writing tests, then display the average for each. The scores can be saved or copied by right clicking on the title bar. SpeedOut is non destructive meaning no files are overwritten and the flash drive doesn’t need formatting to run the test.

Download SpeedOut


3. USB Flash Benchmark

This is a plain and simple speed testing program for USB flash drives which will run a full set of benchmark tests for speeds from 1K chunks up to 16MB, and show the results in a graph. USB Flash Benchmark used to have a companion website to upload results to a database, but that website is no longer available.

usb flash benchmark

Just run the portable program, select your flash drive and press the button. The test will begin with the 16MB test first and continue down to the 1KB test. Be patient as the test does take several minutes to complete. You may as well uncheck the report button as it doesn’t do anything anymore.

Download USB Flash Benchmark


4. 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. Portable, installer, and themed versions are available.

crystaldiskmark usb

For testing slower USB flash drives we recommend dropping the default test size to 50MB/100MB and maybe the number of passes to 1 or maybe 2, then it won’t take so long to complete the test. For faster drives that can be increased to 500MB/1GB. After selecting the USB drive from the drop down list, you can run all 4 tests by clicking All or select a Sequential/4K test to run individually. For USB drives storing media like music, video or photos, the 4K scores are probably not going to be needed.

Download CrystalDiskMark

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