There are many different types of storage devices that can be found on the computer or they can be attached to the computer. There are times when people need more memory. People save documents, photos and videos to their computers all of the time.
It always seems like every time they save something to their computer, that there will always be storage for those items. However, eventually it will get full. Other examples of storage devices that can be added to the computer for additional storage include flash drives.
This is the most common examples that is relatively cheap and easy to use. There are also removable hard drives, but those are more expensive. Disks were previously used and can still be used to save documents.