Learn Linux Shell Scripting - Fundamentals of Bash 4.4

What about multiple partitions?

But first, we'd like to briefly address something you might have found confusing, especially if you're coming from a Windows background where you're used to multiple disks/partitions in the form of C:\, D:\, E:\, and so on. With the preceding directory structure, and the information that the highest point in the filesystem is at /, how does Linux deal with multiple disks/partitions?

The answer is actually pretty simple. Linux mounts filesystems somewhere within the tree structure. The first mount is found on the primary partition we have already covered: it is mounted on /! Let's see how this looks while we check out a new df tool:

reader@ubuntu:~$ df -hTFilesystem     Type      Size  Used Avail Use% Mounted onudev devtmpfs ...