An example system that includes a processor, a memory controller, a memory, and a memory device. The memory controller coupled to the processor. The memory coupled to the memory controller, the memory to store a first copy of data stored according to a first test data pattern for use by a memory scrubbing operation. The memory device coupled to the memory controller. The memory controller may mirror a first set of data stored in a first block of memory of the memory device to a second block of memory of the memory device. The memory controller may also write the first copy of data to the first block of memory as a second copy of data. The memory controller send a first message to the processor indicating a memory fault error for the first block of memory.