This Toner Cartridge prints 6000 pages with an average 5% page coverage. In other words, The amount of pages can vary depending upon the amount of ink printed onto each page. (5% is a standard NEC specification)

Why toner? Why not call it ink? Regular ink dries quickly, which is why cartridges for inkjet printers do not last long. Laser Printers use toner, which is ink in the form of powder. A sealed toner cartridge can be stored for 2+ years prior to usage.

This Drum is good for printing 20000 pages, with an average 5% page coverage. In other words, The amount of pages can vary depending upon the amount of toner printed onto each page. (5% is a standard %manufacturer specification)

What's the difference between a drum and a toner cartridge? A toner cartridge is just that: a cartridge that contains toner. The drum does all the work.