Image forming apparatus

An image forming apparatus, comprising:

• a black (K) developing unit to store a K developer;
• a cyan (C) developing unit, a magenta (M) developing unit, and a yellow (Y) developing unit to store a C developer, a M developer, and a Y developer, respectively;
• at least one auxiliary developing unit to store a developer other than the C, M, Y, and K developers;
• a plurality of photosensitive media, one photosensitive medium formed in each of the C, M, Y, and K developing units and the auxiliary developing unit;
• a plurality of cleaning members, one cleaning member formed in each of the C, M, Y, and K developing units and the auxiliary developing unit, so as to clean surfaces of the plurality of photosensitive media;
• and
• a plurality of waste developer storage units, one waste developer storage unit formed in each of the C, M, Y, and K developing units and the auxiliary developing unit, so as to collect waste developer cleaned by the plurality of cleaning members,
• wherein the waste developer storage unit of at least one of the C, M, Y, and K developing units is larger than the waste developer storage unit of the auxiliary developing unit.

An image forming apparatus, comprising:

• a plurality of developing units to store developer, each developing unit including a developer storage unit;
• and
• a plurality of photosensitive mediums, each photosensitive medium formed in a respective one of the plurality of developing units,
• wherein the developer storage unit of at least one of the developing units is larger than the developer storage units of all of the other developing units.