Ok, so typically, sdB is the USB stick that is used to install ubuntu. in your case, you don't see that, because in the latest version, they started hiding the installation media.
in scandinavia where i live they will stop using cash in the next 5 years... only credit cards, debit cards will be allowed to pay everywhere... so it will be clear where you spend money ... every single cent !!!
and also when you use android or iOS phone... all the data about where you go every day will be saved somewhere.... all the phone calls recorded and saved as well...