Kind of. It's "read and write back" logic, and also "relocate from a flaky block to a less flaky block" logic, and a whole bunch of other things. NAND flash is

Kind of. It's "read and write back" logic, and also "relocate from a flaky block to a less flaky block" logic, and a whole bunch of other things. NAND flash is freakishly unreliable, and it's up to the controller to keep this fact concealed from the rest of the system.