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What is the difference between a drum cartridge and a toner cartridge?

The difference between an HP toner cartridge and an HP drum cartridge.

 

For example an HP toner cartridge holds toner and dispenses it as needed to make copies (in a copier) or to prints pages (in a printer).

The photoreceptor drum is the surface to which the toner adheres before being transferred to the paper. The drum has a long but finite useful lifetime and must be replaced occasionally. Some copiers/printers have drum cartridges which can be changed out by the user. The alternative would be to have a service person open the machine and replace the photoreceptor drum.

So, a drum cartridge allows the user to replace the photoreceptor drum and a toner cartridge allows the user to replenish toner supplies.