Western Digital Technologies, Inc.

Chaitanya Kavirayani

Sampath Raja Murthy

Rishabh Dubey

Nitin Kumar Gupta

Vijay Sivasankaran

Saugata Das Purkayastha

Revanasiddaiah Prabhuswamy Mathada

Satish Kumar

Vineet Agarwal

Ratanvel Nadar

Anshul Modi

A data storage device includes a memory device and a controller coupled to the memory device. The controller is configured to receive a request from a requester for a superblock, determine that one or more blocks of a die of the superblock are expected to fail, and either replace the one or more blocks of the die with another one or more blocks from a different die or add the another one or more blocks from the different die and disable the one or more blocks of the die, and provide the superblock to the requester. The superblock provided to the requester is erased prior to the providing and is the same size as an original superblock.

Full die recovery in ZNS SSD

Aspects of the disclosure provide for management of a flash translation layer (FTL) for a non-volatile memory (NVM) in a Solid State Drive (SSD). The methods and apparatus provide a logical to physical (L2P) table where a first portion of the table is used for mapping frequently accessed hot data to a first subdrive in the NVM. Additionally, a second portion of the L2P table is provided for mapping cold data less frequently accessed than the hot data to a second subdrive, where logical blocks for storing the cold data in the second subdrive are larger than logical blocks storing the hot data in the first subdrive. Separation of the L2P table into hot and cold subdrives reduces the L2P table size that is needed in RAM for logical to physical memory mapping, while at the same time provides lower write amplification and latencies, especially for large capacity SSDs.

Methods and apparatus for variable size logical page management based on hot and cold data

Aspects of the disclosure provide for managing a logical to physical (L2P) table in a Solid State Drive (SSD). Methods and apparatus provide for using a non-volatile memory (NVM) to store the L2P table in its entirety, where the L2P table is separated into a plurality of partitions. The SSD is partitioned into front and back-end processing portions where a partition table is managed by the back-end portion and includes one or more addresses of partitioned portions of the plurality partitions of the L2P table stored in the NVM. The back-end processing portion receives requests from the host via the front-end processing portion and accesses the partition table for scheduling read or write access to the NVM by determining one or more addresses of the respective partitioned portions of the plurality partitions of the L2P table stored in the NVM from the partition table.

Methods and apparatus for implementing a logical to physical address mapping in a solid state drive

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Bengaluru, India

Chaitanya Kavirayani