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Why does FlexHex report a read error at the end of a flash card?

April 26, 2017card Error Flash flexhex read report

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Why does FlexHex report a read error at the end of a flash card?

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Some flash card readers have a bug in their control logic, reporting the card size 512 bytes larger than the actual size. As a result, FlexHex reports an error when it attempts to access the non-existing area at the end of the card. This error usually remains unnoticed because FAT32 clusters are always larger than 512 bytes, and the small 512-byte long tail remains unallocated during card formatting. Note also that you can see this error on Windows XP and later systems only. Windows NT and 2000 report a card size incorrectly (see above), thus compensating for the control logic bug. It is hard to tell how many card readers have that bug (at least some USB 1.1 readers do). In any case, nothing can be done about it – just ignore this error.