Can someone explain "volumes" in a hard drive to me?

Hi - I know very little comp tech. I just installed and initialized an additional hard drive following some instructions I got here. What is a volume? In my disc utility I had to name my "volume". After I did the erase and zero data functions, I noticed an icon for the Samsung Hard Drive I bought and a small icon for the "volume" I named underneath. What is the difference between these things? I want to clone my old hard drive to my new one using SuperDuper, but what do I select...the Samsung icon or the volume icon underneath it (which I named "harddrive2)? Thanks.
By the way, I noticed the same configuration for my original hard drive, which has a Quantum Fireball icon, then Macintosh HD icon underneath. Which one of these do I select in the cloning process? Thanks.

Hi, rdbinboston -
A "volume" is any storage container that the Mac treats as being separate from any other storage container.
Although a volume includes such things as a floppy disk, a zip drive, a tape drive, a CD or DVD, or even a mounted disk image, typically we are referring to hard drives in this context.
With regard to hard drives, a volume can be an unpartitioned drive, or a partition of a partitioned one.
Each volume is treated by the Mac (for most purposes) as if it were a separate, unique device. Partitions of a partitioned drive behave as if they were separate drives.
A hard drive will appear on the desktop as an icon with its namefield immediately below it - the default name for an original drive is Macintosh HD.
Since you state that even your original drive displays an additional icon, is it possible you are referring to the namefield for the icon as being a separate icon? If so, it is not - though it may appear to be separate, it is part of the composite icon for the item. Double-clicking either the icon or the namefield will open the drive's main window.

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