How to mount external / internal devices in Linux :-
Mounting is done with the mount command.
When mounting, you must tell the mount command what is the device or partition you want to mount and what is the mount point. The mount point must be a directory that already exists on your system. For example, to mount your floppy:
$ mount /dev/fd0 /mnt/floppy
In this example, /dev/fd0 is your floppy drive, and /mnt/floppy is the mount point. Now when you access /mnt/floppy, you'll actually access the files on your floppy.
Usually /dev/fd0 is your floppy drive, although some distros are configured so that /dev/floppy is the same thing as /dev/fd0. Usually your CD-ROM is configured the same way: /dev/cdrom is your CD-ROM device (or, more specifically, /dev/floppy is a symbolic link to your actual floppy drive, and /dev/cdrom is a symbolic link to your CD-ROM drive).