I often run into commands trying to do things with linux..
Such as trying to use Shred
The question is, what is the name of my disk, and what form does this command want it in?
This may help:
Get to a Command Line and type in:
You should get
[sudo] password for makerspace:
GNU Parted 2.3
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print devices
You should get something like: