This article will be helpful in Data recovery and also can be used in everyday life.
The fake flash card is the same as a fake of any other item – it looks like something else, not what it really is. This is usually done to artificially add up some value to it.
For example, you have 64GB flash card. It shows 64GB, looks like 64GB, smells like 64GB…
It must be 64GB? Not always. There are many sellers who are selling re-marked flash cards.