If you just put it in a drawer in the office or at home, you can take it out when you use it, but if you put it in a bag, pocket or hang it, the contacts on it are easy to get wet, oxidized and scratched, so combine your own situation. In addition, the card USB flash drive and the ordinary USB flash drive are the same thing, but the appearance is different, so from a practical point of view, it is recommended to use the ordinary USB flash drive.