The Rose Disk is a red version of the 5D's standard Disk with purple gems.
After Yusei was kidnapped by Boss so he'd agree to race for him in the WRGP, Akiza and Mina Simington were able to find where he was being held hostage. Akiza activates the Rose Disk and has Rose Tentacles break the door on the truck open. Boss notices this and orders to speed up the truck. Mina and Akiza still manage to catch up with it, but Yusei warns Akiza and she impulsively jumps to one of the doors. As Yusei helps her get on board, the door falls off taking her Rose Disk along with it.
In Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia, the player can find this Duel Disk in the south west room of the Sector Security building.