How to repair micro sd 16gb card? It shows 31mb

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Beware of cheap cards being sold on Ebay. Many are fake. Apparantly there are those who try to pass off old low capacity cards as 16 GB cards. Some cards are listed as 16 Gb, which means 16 gigabits, or only 2 gigabytes. Many are fooled into thinking this means 16 gigabytes.