Addressing page-correlated read issues using intra-block parity

A method for intra-block recovery from memory page read failures of memory pages, said method comprising:

• providing a data storage device comprising a plurality of memory pages, wherein the plurality of memory pages are organized as a plurality of blocks, wherein each of said plurality of memory pages comprises a plurality of non-volatile memory cells;
• grouping a proper subset of memory pages of a block into at least one window, each window comprising a plurality of memory pages of said block, at least two of said pages of said proper subset of pages having different page numbers, and
• determining a window parity page for each window of said block for a recovery of page read failures of said memory pages of said block,
• in response to determining that a predefined number of memory pages of said window is not yet written, maintaining said determined window parity page as part of a corresponding window of memory pages of said block, and
• in response to determining that a predefined number of memory pages of said window is written, refraining from maintaining said determined parity page as part of said corresponding window of memory pages of said block,
• wherein memory pages assigned to a specific window of the at least one window are memory pages which are least likely to have correlated failures.

A system for intra-block recovery from memory page read failures of memory pages, said system comprising:

• a data storage device comprising a plurality of memory pages, wherein the plurality of memory pages are organized as a plurality of blocks, wherein each memory page of said plurality of memory pages comprises a plurality of non-volatile memory cells;
• and
• a hardware-based memory controller, the hardware-based memory controller configured to:
• group said plurality of memory pages of a block into at least one window, each window comprising a proper subset of said memory pages of said block, at least two of said pages of said proper subset of pages having different page numbers, wherein each window is a logical window comprising non-consecutive memory pages of a block;
• determine a window parity page for each window of said block for a recovery of page read failures of said memory pages of said block;
• and,
• in response to determining that a predefined number of memory pages of said window is not yet written, maintain said determined window parity page as part of a corresponding window of memory pages of said block, and,
• in response to determining that a predefined number of memory pages of said window is written, refrain from maintaining said determined window parity page as part of said corresponding window of memory pages of said block.

A non-transitory computer readable medium comprising computer executable instructions which when executed by a computer cause the computer to perform a method of:

• providing a data storage device comprising a plurality of memory pages, wherein memory pages are organized as a plurality of blocks, wherein each memory page of said plurality of memory pages comprises a plurality of non-volatile memory cells;
• grouping a proper subset of memory pages of a block into at least one window, each window comprising a plurality of memory pages of said block, at least two of said pages of said proper subset of pages having different page numbers;
• determining a window parity page for each window of said block for a recovery of page read failures of said memory pages of said block;
• in response to determining that a predefined number of memory pages of said window is not yet written, maintaining said determined window parity page as part of a corresponding window of memory pages of said block;
• and
• in response to determining that a predefined number of memory pages of said corresponding window is written, refraining from maintaining said determined window parity page as part of said corresponding window of memory pages of said block.

A method for intra-block recovery from memory page read failures of memory pages, said method comprising:

• providing a data storage device comprising a plurality of memory pages, wherein the plurality of memory pages are organized as a plurality of blocks, wherein each of said plurality of memory pages comprises a plurality of non-volatile memory cells;
• grouping a proper subset of memory pages of a block into at least one window, each window comprising a plurality of memory pages of said block, at least two of said pages of said proper subset of pages having different page numbers, and
• determining a window parity page for each window of said block for a recovery of page read failures of said memory pages of said block,
• in response to determining that a predefined number of memory pages of said window is not yet written, maintaining said determined window parity page as part of a corresponding window of memory pages of said block, and
• in response to determining that a predefined number of memory pages of said window is written, refraining from maintaining said determined parity page as part of said corresponding window of memory pages of said block,
• wherein memory pages assigned to a specific window of the at least one window are memory pages which are written prior to a pause of write operations to a block.