How to test and check for a fake SD card Video

This short video will show you how to use the free Program H2Testw to check your SD card capacity and speed. 

There is a big market for fake SD and microSd cards and websites such as eBay and Amazon  make it extremely easy to order fake products from China and the ability to market them on US and European  at the touch of a button.

The biggest danger with fake storage devices comes from them over-reporting their storage capacity, often resulting in the camera quietly failing to write new photos and video to the card only for users to realize after their holiday or once ina lifetime experience that none of it is stored in the card and there is no way to recover the lost photos and memories.

Sound like a nightmare scenario?

It is! Which is why we recommend testing you cards before you take off on your trip or adventure, specially if you bought your card online or if the price was a bit “too good to be true”.

H2testw is a simple tool that is distributed for free, does not require installation and offers a very simple, easy-to-use interface. It will check your device for errors and report back your card’s real storage capacity and read/write speed.

Here is an example output:

Warning: Only 31987 of 31988 MByte tested.
The media is likely to be defective.
1.9 GByte OK (4026368 sectors)
29.3 GByte DATA LOST (61483008 sectors)
Details:0 KByte overwritten (0 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
29.3 GByte corrupted (61483008 sectors)
0 KByte aliased memory (0 sectors)
First error at offset: 0x0000000077ca8000
Expected: 0x0000000077ca8000
Found: 0x0000000000000000
H2testw version 1.3

Writing speed: 3.2 MBytes
Reading speed: 9.85 MByte/s

H2testw v1.4

Any data lost or corrupted will be clear indicators that you are dealing with a fake SD card, which has reported more storage capacity than it actually has. You should also check the reading and writing speed to make sure it matches the speed class advertised.

That speed will be specially important when shooting HD video or pictures at high Frames per second, if you are not getting speeds at and above the Minimum Serial Data speed for your card class, you are likely dealing with a fake card and should consider returning it.

If you think you have bought a fake or counterfeit item, you can email the manufacturer of the card and they can confirm this and take the appropriate action against the seller. If bought online make sure you also report this to the the marketplace where you bought it (e.g. Ebay and amazon) and ask for a refund.


This table shows the results for the MINIMUM speed your car should be reaching depending on its Speed Class

For more information you can check this very thorough article on the topic.

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