Should be FAT32
otherwise with exFAT you're just going to end up with a corrupt sdcard. U should not be trying format it on the pc anyway.
When u did chkdsk make sure you choose repair boot also, then format the card in a smart phone. I think your card is legit and not a fake, it somehow got corrupt, but is fix'able. This happend to me after a bad ROM FLASH, but was easily repaired with repair boot from chkdsk cmd.
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