Unless it's one set why keep them on the card? That's putting alot of trust on a cheap card
Both Lexar and Sandisk professional-level cards come with a free program that can help you recover the images on your card if you accidentally delete them. If you delete something accidentally, STOP SHOOTING, bring the card home, run the card through the program, and you’ll probably get the shot back–even if you formatted the card. I have not tried Sandisk’s program for memory cards, but I give high marks to Lexar’s Image Rescue Software.