There are some important items to consider before trying to decide what type of cd duplicator to purchase. A tower is a group of cd recorders inside a case chained together and connected to a computer. The image is then transferred via the duplicator hardware to the chain of recorders which then write the disks simultaneously. Towers are recommended if you need to make a large number of disks at once. They are relatively low cost and are the most popular of all cd duplicators.
Speed is dependent on the speed of the recorders housed in the tower.
There is also usually a reject spindle. Autoloaders usually have one or two cd recorders. Autoloaders are recommended if a priority is unattended copying. Unattended copying allows duplicating during hours when others are not present, eliminating any complaints of noise. All the blank disks can be loaded into the Autoloader at once, eliminating the need for an operator.