EFFICIENT MANAGEMENT OF PAGE RETIREMENT IN NON-VOLATILE MEMORY UTILIZING PAGE RETIREMENT CLASSES

摘要

In at least one embodiment, a non-volatile memory array including a plurality of blocks each including a plurality of physical pages is controlled by a controller. The controller implements a plurality of nested page retirement classes each defined by a respective one of a plurality of different nested subsets of page indices of physical pages within the plurality of blocks that are to be considered retired from use. For each block among the plurality of blocks, the controller updating an indication of a page retirement class to which the block belongs in response to detection of a retirement-causing error in a data page stored in a physical page of the block. The controller forms block stripes for storing data from the plurality of blocks based on the page retirement classes of the blocks.