I know there are a lot of tools that can test the capacity of flash drives but in my case this was not really useful.ĭoes anyone know if there are other tests or tools available (except for the tools that test the capacity) for detecting fake flash drives ? I think it's a hardware issue (bad/cheap controller inside?) but I don't know how they do it. I tried to fix it with diskpart but the disk dissapears from the list before I can select it. I tested it on different computers, I get the same error on every computer. Now a few weeks later one of these flash drives is dead: 'unkown usb device, set address failed'. I was expecting the flash drives to be very slow and only have a small percentage of the stated capacity but at first it looked OK.Įvery test always 'confirmed' the stated capacity, but I wasn't convinced it would continue working. I tested them with some specific tools (H2testw, FakeFlashTest, ChipGenius. It also has the same very quick test that RMPrepUSB has.A few weeks ago I bought some cheap 'Vansung' or 'Vansuny' flash drives on Amazon. 8 minutes for my fake 16GB USB pen which was actually 2GB) and detects a fake drive much more quickly than H2TESTW (it stops as soon as an error is found too!). This has a similar 'fill-up with files' test to H2TESTW but again only takes a fraction of the time that H2TESTW takes (approx. It does erase the contents though as it tests ALL memory (H2TESTW only tests the area which has no files).Īnother alternative is FAKEFLASHTEST which is much easier to use. This gives very similar results to H2TESTW but is much quicker, especially if the flash memory is a fake.

RMPrepUSB has a Quick Size Test which can test a fake 32GB Flash device in about 1 minute (good ones take 20-30 minutes). These have the memory multiply-mapped and so we do not need to detect bit errors, we just need to detect gross chunks of data being wrong.

This is totally unnecessary for detecting fake flash devices. H2TESTW fills up the drive with a test pattern and then reads all of it back.

H2testw vs fakeflashtest