The toner cartridge contains the fine powder that is fused onto paper to create text and images. The drum is a cylindrical component that transfers the toner onto the paper in the correct pattern. Both are consumable items that need replacing periodically, though drums typically last much longer than toner cartridges. On Toshiba MFDs, the drum unit is engineered for extended life and is usually replaced by a service engineer during a scheduled maintenance visit. For either Toshiba or Develop, check the exact device model, consumable part number and manufacturer compatibility information before ordering; do not assume compatibility across models or brands.