A Flash Drive or USB stick is the simplest storage devices that will hold a prescribed amount of data. USB flash drives, USB thumb drives and hard drives need directions for what to do - you have to drag and drop your images either onto or from the flash drive.nnThePhotoStick is a smart flash drive that does everything a flash drive does but with brains. It will automatically detect new images and back them up on its internal storage without fuss or loss of data.