Personal data and sensitive information
Portable storage devices such as USB sticks are fundamentally less secure storage options than servers and internal hard drives. Especially if the origin of the stick is unknown. Starting files on the USB stick can have serious consequences. Suppose the content is infected with a virus, then by opening it you have compromised your system and your employer's network. But even with the cleaning of sensitive data, deleting files is not enough to really delete that data. As a result, the risk of data leaks with these types of devices is very high.
You never know who might be walking by your desk when you're not there, so it's not a good idea to leave sensitive information unattended. This applies to the information on your screen as well as on your desk. Whether you're away for a short break, always lock your computer screen and clear your desk. Employees learn why a locked screen and a tidy desk and office contribute to a safe organization. This also applies to work-related documents that do not belong in the trash, but in a shredder or a secure container.