I have a funny story to share about that. I'm trying to remember the chat, and here's how it basically went:
Builderman: Man i cant get my usb stick (flash drive) cover back on
Me: Why would you take it off in the first place?
Builderman: Why shouldnt u?
Me: Because there is a good chance that you'll damage the circuit board and screw up traces?
Builderman: But hwo am i going to add the card in?
Me: ...what card?
Builderman: this usb stick is very light, so i thought that you have to buy another stick to put into the usb card so it works
Me: *facepalm*
Me: You dont need to buy additional stuff if you have a flash drive, you just plug it into the USB port and go. Derp.
Builderman: ooo tanks
tl;dr: Builderman thought that because the flash drives are light, you had to buy an additional card and open up the case and add it in.