Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
I've had this card for a couple months as a backup for my tablet/phone to put movies on, so I haven't needed to use it until this past weekend. Apparently everything reads properly on the computer but on my mobile devices none of the files are visible. Both my phone and tablet say the card is corrupt and it repeatedly has me format it. It was only $10 so I tried it out since it's a secondary card, but I'll stick with a name that I can trust next time.