How To Check Fake USB Drive and Flash Memory Card

Update: Since the original file can only be downloaded from a German site, a lot our dear readers requested me to instead download it and upload it in my site. You can now DOWNLOAD THE TOOL HERE.

Is there a way to check if the USB drive or Flash memory card (SD card, miniSD, microSD, Memory Stick, etc.) you bought is fake? Can you tell the difference between a genuine device from a counterfeit?

Fake USB DrivePrices of memory and USB drives are insanely low specially on online stores. Just browse on eBay and you will see a lot of these devices, mostly from China. I’m not saying that all products from China are fake or fraud, but a number in devices in low price range are too good to be true.

Note, that 90% of my y gadgets here on top of my table right were all made from China and I diligently test them if the description posted on the seller’s website is exactly what the product is capable of. Sometimes, the description doesn’t match what is being advertised so I just have to balance my choices. Will I keep the product or should I send it back to the seller? What I usually do is just to keep the product and give a negative feedback on the seller, if they don’t want to keep their replacement warranty.

So what will you do if you are having doubts on the USB or Flash memory card you bought? Here’s what you can do:

1. The easiest way is to check the product against what is shown on the product list of the original manufacturer. If there’s no existing product from the site of the original manufacturer, it obviously fake. In fact, you need to do this step even before placing your order.

2. Internally, you can’t tell the difference between a counterfeit and a genuine USB or memory cards. However, there’s already a tool you can use. Download H2testw from this site: Heise Online  (use the new download link above or the download button below the post). The site is in German, just let Google translate it for you.

The H2testw will help you in checking various kinds of errors for any other storage media like USB drive, memory cards, internal and external hard drives and even network volumes.

Here are sample screenshots When I tested my new purchased 32GB Sony USB drive.

H2TestW Interface for testing USB

You can set the interface to use either in Deutsch (German) or English.

Flash Memory USB Test

I’m glad the test was finished without errors. It means my 32GB USB drive is genuine!


Here’s a sample test report for a fake 64 GB USB.

The media is likely to be defective.

3.8 GByte OK (8084847 sectors)
58.6 GByte DATA LOST (122921617 sectors)
Details:710.5 KByte overwritten (1421 sectors)
7.6 MByte slightly changed (< 8 bit/sector, 15630 sectors)
58.6 byte corrupted (122904566 sectors)
710.5 KByte aliased memory (1421 sectors)
First error at offset: 0x000000003cef8470
Expected: 0xeb7ac43a237c5170
Found: 0xeb7a843a237c5170
H2testw version 1.3
Writing speed: 9.24 MByte/s
Reading speed: 10.8 MByte/s
H2testw v1.4


The only drawback that I’ve found in using this tool is, it’s a bit slow in testing my USB. I guess it has something to do with what Class number is the device (mine is Class 4) and how big the capacity it. 

For your peace of mind, I highly recommend you this tool to check if your memory card or USB drive is genuine or not.  And to top it all, this tool is FREE!

 DOWNLOAD THE TOOL HERE. or click the button below:

Download Fake USB and Memory Card Checker

The program was developed by Herald Bögeholz.

9 thoughts on “How To Check Fake USB Drive and Flash Memory Card

  1. A good consumer who think of something in return that would last for a long time already would doubt when the price tag is pretty lower than what you can see in the general market especially the known brands. But then you just have to find ways, just like what you have here, to check the authenticity.

  2. Whoa! I didn’t know there can be fake flash drives out there. Now I know why a lot are so cheap. I bought mine from CD R King. I’ll be using this tool you suggested. Thanks for sharing this!

    • I just tested my brother-in-law’s microSD which has 64GB in capacity and we’ve found it’s fake! And to think, he even bought it in Singapore 🙁

  3. This tool takes very long time, if you want to test in seconds, I found two tools:
    1. RMPrepUSB (Quick Speed Test – Returns result in 3 Seconds!)
    2. SD Insight Android App.

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