H2testw English Windows

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H2testw 1.4 has proven itself to be the best of breed for detecting counterfeit Flash drives. It is extremely easy to use and proves detailed information. Created by Harald Bögeholz, the interface is in German but has the option to run in English. It is free and standalone. Nothing is installed into the operating system. Designed for Windows it can run under Linux if Wine is installed. It will not run under Macs. If your computer can not run the software – ask a colleague or friend who has a windows based computer to help you test.

To learn more and for download information

Sections covered:

  • Gold Standard rating for H2testw 1.4 Why do you give this software such a high rating?
  • Results for a 64GB USB drive purchased on eBay, using H2testw 1.4
  • Results from H2testw have been verified on drives detected as fakes
  • Acknowledgements
  • Download Links
  • Note To Flash Drive Sellers

Gold Standard rating for H2testw 1.4? Why do you give this software such a high rating?

We give H2testw 1.4 the highest rating and recommend it for testing counterfeit USB Flash Drives for the following reasons:

  1. Easy to Use
  2. While in German an English Execution is possible
  3. Stand alone executable file – no installation required to run it
  4. You do not need administrator privileges on a computer to run it
  5. Tested to work on 1.1 and 2.0 USB drives
  6. Tested to work on 1.1 and 2.0 USB Ports
  7. Tested to work to analyze drives advertised as 4GB, 8GB, 16GB, 32GB and yes …64 GB capacity.
  8. Reports seen capacity – what the operating system sees size to be.
  9. Will write 1 GB files up to the reported size – requiring no work on your part except patience if it is a large drive and a slow computer
  10. Will read all the files it wrote and verify them
  11. Will produce a report. a) short if all is well b) detailed if there issues found.
  12. The program is offered free

The readme.txt file provides:

  • Explanation of the program and what it does for general computer users
  • Information on how to interpret the results
  • Technical information for those who have a deeper understanding of data storage and file writing and for the skeptics out there. Output results can easily be copy pasted into notepad to be saved as a text file.

Test results for a 64GB USB drive purchased on eBay, using H2testw 1.4

Sample Output For A Fake 64 GB Drive

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

This is 4GB USB flash drive not a 64GB USB flash drive. It is of poor quality. As 4GB drive it should be about 3.9 GB not 3.8 GB formatted. This indicates in low level formatting a lot of bad sectors had to be locked out. Usually flash chips like these are rejected for major brands and should be destroyed. Unfortunately instead of the furnace flames these chips are leaving the back door of factories to be resold. These chips are a favorite for counterfeiters to reprogramme. Low cost, big profit.

The results from H2testw have been verified on drives detected as fakes. How?

  1. Drives were dissembled
  2. Controller chips identified
  3. Flash chip identified

Searches on the actual flash drives using their identification number revealed their true capacity. These matched the output from the H2testw Program.

In a few cases, when drives were disassembled, epoxy glue removed holding the flash drive to the bottom casing, quality control stickers were found with a size circled. The size? Exactly what H2testw reported as the capacity it could write to. All drives autopsied for investigation and validation of this program were purchased on eBay.

We do not see any other program that can match these features. Therefore, H2testw has been adopted as the Gold – Standard to detect and test fakes.

eBayers use this program to PROVE they have received a fake from a seller. It is confirmed with more eBayers reporting the same results for the same drive model. We have been able to prove this repeatedly, to the point we have only one conclusion. If a drive model fails capacity testing with H2testw then any for that listing on eBay is a fake. Having more eBayers test the same model only confirms what H2testw reported. The autopsies on counterfeit drives have also proven the value of this program. The report is a God send for eBayers who must file disputes. It gives them evidence to submit with their case.


To Herald Bögeholz who wrote the Program H2testw, Thank You!
To c’t Magazin für Computertechnik, Thank You!
To www.heise.de for hosting the download of the programme, Thank You!

People around the world who have suffered the misfortune to receive a Counterfeit Flash drive are grateful for your contribution in the struggle against False Capacity USB Flash Drives and memory cards.

Download links

Using Google translation into English

Article Manipulated data loss caused by USB sticks – Heise Online

H2testw 1.4 Website – English

Note: Using translation can slow down access speed of the web pages.


H2testw 1.4 Website – German – Direct Site Access

You may prefer to search with Google for the software. Type in H2testw 1.4 which is the current version at the time of listing on this page. To search all versions you can just type in H2testw.

Direct Download Of Software For version 1.4 of H2testw

Note To Flash Drive Sellers

Please test your merchandise using this software. Do not offer for sale unless the drives are able to pass testing. You do not want to face the consequences of angry buyers. If you have drives which fail, contact the source you acquired from. Submit the proof you have as evidence for receiving counterfeit merchandise.

If the drives you offer for sale are able to pass the testing of H2testw 1.4 – congratulations!

Please indicate this in your advertising or listings. Let prospective buyers know that you have tested. That your drives pass with the program and that you are able to guarantee the true advertised capacity (minus a small overhead for operating system file formatting.). This will increase your sales potential.

If you find the tool H2testw 1.4 useful to you, please return and leave a comment on your experiences with it.

  1. joey
    June 23, 2012 at 4:03 am

    i agree with chuckie, there are a lot of counterfeit usb rives and you can copy but you cant actually open the files. its all but corrupt.

  2. belle
    August 2, 2011 at 2:00 pm

    I’d just like to know where to report the fakes. I bought one off a street vendor and well … Fake 🙂 live and learn I suppose. But I would like to prevent others from being taken for a ride so anyone know where to report?

  3. Femi
    June 10, 2010 at 8:32 am

    I tested a 64GB flash drive, which gives the following output:

    Warning: Only 60952 of 65583 MByte tested.
    The media is likely to be defective.
    2.5 GByte OK (5431680 sectors)
    56.9 GByte DATA LOST (119398016 sectors)
    Details:0 KByte overwritten (0 sectors)
    0 KByte slightly changed (< 8 bit/sector, 0 sectors)
    56.9 GByte corrupted (119398016 sectors)
    0 KByte aliased memory (0 sectors)
    First error at offset: 0x000000001ad38000
    Expected: 0x000000001ad38000
    Found: 0x0000000000000000
    H2testw version 1.3
    Reading speed: 3.33 MByte/s
    H2testw v1.4

    Data was already written on the drive before testing.
    Though it gave this error but yet was able to successfully write 62GB of data to the flash.
    I deleted the h1wt2…h62wt2 files and copied about 26Gb MP3 files on the the drive and it works fine still showing the correct amount of free space.
    Not too sure about this tool. I hope it is not just a tool to discredit fake flash drive by the Brand vendors.

    • Chuckie
      June 11, 2010 at 1:06 pm

      Try to open (play) the MP3 files. If the drive’s capacity is fake, some of the files (probably the ones that got copied first or last) wil be corrupted and you won’t be able to open them.

      The sole fact that you “see” the files as being on the drive doesn’t necessarily mean they are really there. It works in a way similar to a library catalog, and it can be falsified. You open the catalog, read it and see that there is supposed to be a certain book in the trird shelf on the second floor. However, when you actually try to go there, you may find out that the library actually has no second floor at all.

      (For those who want a bit more “technical” description, look up “FAT (file allocation table)”. That is the equivalent of the library catalog.)

  1. April 10, 2012 at 4:02 am
  2. July 18, 2011 at 12:20 am
  3. March 5, 2010 at 4:55 am
  4. February 3, 2010 at 4:11 am

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