US Patent 11210168 Error handling optimization in memory sub-system mapping

A system includes a memory device having blocks of memory cells. A processing device is operatively coupled to the memory device, the processing device to detect an error event triggered within a source block of the memory cells. In response to detection of the error event, the processing device is to read data from the source block; write the data into a mitigation block that is different than the source block; and replace, in a block set map data structure, a first identifier of the source block with a second identifier of the mitigation block. The block set map data structure includes block location metadata for a data group, of the memory device, that includes the data.