An extract from a book-
Linux organizes attached storage as block devices, you can move to the
/sys/block/directory and list its contents. Among the contents will be a directory calledsda/. (Remember thatsdastands for Storage Drive A.) That’s the first drive used by your system on boot:Change to the
sda/directory and runls. Among its contents, you’ll probably see files with names likesda1,sda2, andsda5. Each of these represents one of the partitions created by Linux to better organize the data on your drive.
On my Ubuntu machine, the below partitions are shown for sda-
Running df -h | grep sda gives
As seen, /dev/sda5 is mounted on '/' and /dev/sda1 on /boot/efi.
Why is there no mounting point for partition sda2?

