USB sticks or USB Flash drives can be transferred and connected from one computer to another. This way, it can easily transfer the malware and viruses to another computer. Second, USB sticks are small in size, and that's why you can easily lose them. They can get stolen, or they may get damaged by laundry if you keep them in your pockets and forget. Some people use keychains or necklaces to keep their Flash drive safe. Third, some manufacturers make low-quality USBs, which can threaten your important data. Fourth, USB sticks do not have the Broadcasting feature in them. Fifth, they don't have a great lifespan. A USB stick can only have approximately 10,000 reads and write cycles. But some high-quality USB manufacturers can provide you with from 10,000 to 100,000 read and write cycles.