Data Folding in 3D Nonvolatile Memory

摘要

Data that is initially stored in Single Level Cell (SLC) blocks is subsequently copied (folded) to a Multi Level Cell (MLC) block where the data is stored in MLC format, the data copied in a minimum unit of a fold-set, the MLC block including a plurality of separately-selectable sets of NAND strings, data of an individual fold-set copied exclusively to two or more word lines of an individual separately-selectable set of NAND strings in the MLC block.

主权项

1. A method of managing data in a three dimensional nonvolatile NAND memory comprising:
copying first data of a first fold-set from a Single Level Cell (SLC) portion of the three dimensional nonvolatile NAND memory where the first data is stored in SLC format to a Multi Level Cell (MLC) block where the first data is stored in MLC format along two or more word lines in a first separately-selectable set of NAND strings of the MLC block, a fold-set being a minimum unit of data folding; and copying second data of a second fold-set from the SLC portion where the second data is stored in SLC format to the MLC block where the second data is stored in MLC format along two or more word lines in a second separately-selectable set of NAND strings of the MLC block.