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The Brother HL-6100 printer series needs both the TN4100 toner and a DR4000 drum unit to work correctly. The difference between the two is that the TN4100 is a toner cartridge that contains the toner powder and the DR4000 is a drum unit that connects to the toner cartridge and rolls the toner onto the paper using an electrically charged cylinder during printing.
The drum doesn't need to be replaced as often as the toner, as the drum lasts for 30000 pages.