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Raid difficulty

From WoWWiki

Prior to Patch 3.2.0 this setting was controled by the Dungeon difficulty setting to determine if a raid was to be a normal mode (10 man raid) or heroic mode (25 man raid).

All WotLK raids introduced before Patch 3.2.0 will use 10-player mode for the former normal mode (10 man raids) or 25-player mode for the the former heroic mode (25 man raids).
All newer raids begining with the Crusaders' Coliseum can use the 10-player heroic mode and 25-player heroic mode settings to access harder versions of the raids, not to be confused with hard mode events /actions within the same raids.

Patch changes

Patch 3.2.0 (2009-08-04): Intoduced.

Prior to Patch 3.2.0 you had to use the Dungeon difficulty setting.

See also