Patent ID: 11955184
Assignee: SANDISK TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 14:
15. A non-volatile storage system comprising:
a three-dimensional memory structure comprising a plurality of blocks, the blocks separated from each other by isolation regions, each block comprising a plurality of NAND strings and a plurality of word lines associated with the NAND strings, the three-dimensional memory structure having a plurality of bit lines, each NAND string associated a bit line, each block comprising a plurality of sub-blocks, each sub-block comprising a group of the NAND strings in the block, each block comprising a select line connected to the group of the NAND strings in the sub-block; and
one or more control circuits connected to the three-dimensional memory structure, wherein the one or more control circuits are configured to:
apply a select voltage to the select line of a selected sub-block connected to a selected group of the NAND strings in a selected block;
program a selected group of memory cells in the selected sub-block, wherein the selected group of memory cells are connected to a selected word line in the selected block, wherein the selected group comprises a first set of memory cells in a first region of the selected sub-block and a second set of memory cells in a second region of the selected sub-block, wherein the first set of memory cells are a different distance than the second set of memory cells to a first isolation region that separates the selected block from an adjacent block, wherein the first set of memory cells and the second set of memory cells have a different physical characteristic that leads to a different programming characteristic;
read the first set of the memory cells with a first set of read parameters while locking out the second set of the memory cells; and
read the second set of the memory cells with a second set of read parameters while locking out the first set of the memory cells, wherein the first set of read parameters are different from the second set of read parameters to compensate for the different programming characteristic in the memory cells in first and the second regions of the sub-block.