Today however, we have 128GB 'fake' SD cards and these can take hours to test using H2TESTW and chkflsh, as these tests 'fill it all up' and then 'read it all back' - every single byte and only then does it give a report.
In 2008 when H2TESTW was last revised, they had 256 MB flash sticks and you needed to be really rich to afford an 8GB device. The problem with these utilities is that they attempt to write and read to all the bytes in the memory (or in the case of H2TESTW, to all the unused filespace). There are also other flash test utilities such as chkflsh and USB Flash Drive Tester. There are several utilities that are suggested for testing these devices, the 'Gold Standard' one being H2TESTWv1.4 written for (however, I am not sure why this is the 'Gold Standard' as it does not test the area already occupied by your files). These devices usually work for any reads or writes of the first 8GB to the memory chip inside it, but any writes made to locations past 8GB, will either overwrite the data already in the 8GB chip(s), or the controller inside the device will simply not write the data at all, but signal back to your computer/camera/smartphone that the write worked fine! As the directory and cluster map of a FAT32 file system is stored within the first few 100MBs, the filenames will be listed by Windows Explorer or your camera just fine (until you try to look at that data that is stored past 8GB).įake 2TB devices are very common at the moment - you only have to look at the price to know they are fake!
It's like sticking a Ferrari badge on a VW Beatle and selling it for 1/3 of the price of a real Ferrari and then saying everyone does it so it's OK! For instance a 64GB SD card may actually contain an 8GB Flash memory chip but Windows or your camera or smartphone will detect it as a 64GB device and even successfully format it as a 64GB device (though often, if you format it as NTFS, it may fail to format!).
These devices are not 'faulty' per se, they have been deliberately re-programmed to lie about their size. This seller seems to think that it is normal for all cheap SD cards to be fake! It shows just how widespread the problem is.
They have been deliberately re-programmed to lie to you!
0 kommentar(er)
