Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Peter Grayson

Daniel Lee Helmick

Sergey Anatolievich Gorobets

Liam Michael Parker

Alan David Bennett

Yehuda Hahn

Xinde Hu

Neil David Hutchison

Rodney Brittner

Horst-Christoph Georg Hellwig

David Landsman

Matias Bjorling

Matias Bjørling

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of streams. When a write command is received to write data to a stream, change log data is generated and stored in the RAM1, the previous delta data for the stream is copied from the RAM2 to the RAM1 to be updated with the change log data, and the updated delta data is copied to the RAM2. The delta data stored in the RAM2 is copied to the storage unit periodically. The controller tracks which delta data has been copied to the RAM2 and to the storage unit. During a power failure, the delta data and the change log data are copied from the RAM1 or the RAM2 to the storage unit.

Data integrity protection of SSDs utilizing streams

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller and a media unit. The capacity of the media unit is divided into a plurality of zones. The controller is configured to make informed use of errors by update zone metadata to indicate one or more first logical block addresses were skipped and to indicate the next valid logical block address is available to store data. The controller is further configured to update zone metadata to recommend to the host device to reset one or more full zones, to recommend to the host device to transition one or more open zones to a full state, to alert the host device that one or more open zones have been transitioned to the full state, and to notify the host device of the writeable zone capacity of each of the plurality of zones.

Zoned namespaces in solid-state drives

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM), second random access memory (RAM), and a storage unit divided into a plurality of streams. By restricting the host to have a minimum write size, the data transfer speed to RAM, RAM, and the storage unit can be optimized. A temporary buffer is utilized within the RAMto update parity data for the corresponding commands. The parity data is updated in the RAMand written to the RAMin the corresponding stream. The parity data may be copied from the RAMto the RAMto update the parity data in the temporary buffer when commands are received to write data to corresponding streams. As the parity data is updated, the corresponding command is simultaneously written to the corresponding stream.

Storage devices hiding parity swapping behavior

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of zones. A first command to write data to a first zone is received, first parity data for the first command is generated in the RAM1, and the data of the first command is written to the first zone. When a second command to write data to a second zone is received, the generated first parity data is copied from the RAM1 to a parking section in the storage unit, and second parity data associated with the second zone is copied from the parking section to the RAM1. The second parity data is then updated in the RAM1 with the data of the second command and copied to the parking section.

Data parking for ZNS devices

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of streams. When a write command is received to write data to a stream, change log data is generated and stored in the RAM1, the previous delta data for the stream is copied from the RAMto the RAM1 to be updated with the change log data, and the updated delta data is copied to the RAM2. The delta data stored in the RAM2 is copied to the storage unit periodically. The controller tracks which delta data has been copied to the RAM2 and to the storage unit. During a power failure, the delta data and the change log data are copied from the RAM1 or the RAM2 to the storage unit.

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller and a storage unit divided into a plurality of streams. The storage unit comprises a plurality of dies, where each die comprises two planes. One erase block from each plane of a die is selected for stream formation. Each erase block comprises a plurality of wordlines. A stream comprises one or two dies dedicated to storing parity data and a plurality of dies dedicated to storing user data. The stream further comprises space devoted for controller metadata. The storage device restricts a host device to send write commands in a minimum write size to increase programming efficiency. The minimum write size equals one wordline from one erase block from each plane of each die in the stream dedicated to storing user data minus the space dedicated to metadata.

Storage devices having minimum write sizes of data

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of zones. When a write command is received to write data to a zone, change log data is generated and stored in the RAM1, the previous delta data for the zone is copied from the RAM2 to the RAM1 to be updated with the change log data, and the updated delta data is copied to the RAM2. The delta data stored in the RAM2 is copied to the storage unit periodically. The controller tracks which delta data has been copied to the RAM2 and to the storage unit. During a power failure, the delta data and the change log data are copied from the RAM1 or the RAM2 to the storage unit.

Data integrity protection of ZNS needs

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM), second random access memory (RAM), and a storage unit divided into a plurality of zones. By restricting the host to have a minimum write size, the data transfer speed to RAM, RAM, and the storage unit can be optimized. A temporary buffer is utilized within the RAMto update parity data for the corresponding commands. The parity data is updated in the RAMand written to the RAMin the corresponding zone. The parity data may be copied from the RAMto the RAMto update the parity data in the temporary buffer when commands are received to write data to corresponding zones. As the parity data is updated, the corresponding command is simultaneously written to the corresponding zone.

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of zones. A first command to write data to a first zone is received, first XOR data is generated in the RAM1, and the data of the first command is written to the first zone. When a second command to write data to a second zone is received, the generated first XOR data is copied from the RAM1 to the RAM2, and second XOR data for the second zone is copied from the RAM2 to the RAM1. The second XOR data is updated with the second command, and the data of the second command is written to the second zone. The updated second XOR data is copied from the RAM1 to the RAM2.

ZNS parity swapping to DRAM

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller and a media unit. The capacity of the media unit is divided into a plurality of zones. The media unit comprises a plurality of dies, and each of the plurality of dies comprising a plurality of erase blocks. The controller is configured to compare an estimated age of a first available erase block in each of the plurality of dies to one another and select one or more of the first available erase blocks from one or more dies of the plurality of dies based on the estimated ages to form a first zone. At least one first available erase block from at least one die of the plurality of die is excluded from the first zone.

Zone formation for zoned namespaces

Data parking for SSDs with zones

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller and a storage unit divided into a plurality of zones. The storage unit comprises a plurality of dies, where each die comprises two planes. One erase block from each plane of a die is selected for zone formation. Each erase block comprises a plurality of wordlines. A zone comprises one or two dies dedicated to storing parity data and a plurality of dies dedicated to storing user data. The zone further comprises space devoted for controller metadata. The storage device restricts a host device to send write commands in a minimum write size to increase programming efficiency. The minimum write size equals one wordline from one erase block from each plane of each die in the zone dedicated to storing user data minus the space dedicated to metadata.

The present disclosure generally presents a method and apparatus to provide a bounded latency, where a device would report 'non-service' of a command at the defined system level timeout or earlier if the device was unable to successfully return the data to the host.

Bounded latency and command non service methods and apparatus

The present disclosure generally relates to methods of operating storage devices. The storage device comprises a controller comprising first random access memory (RAM1), second random access memory (RAM2), and a storage unit divided into a plurality of streams. By restricting the host to have a minimum write size, the data transfer speed to RAM2, RAM1, and the storage unit can be optimized. A temporary buffer is utilized within the RAM1 to update parity data for the corresponding commands. The parity data is updated in the RAM1 and written to the RAM2 in the corresponding stream. The parity data may be copied from the RAM2 to the RAM1 to update the parity data in the temporary buffer when commands are received to write data to corresponding streams. As the parity data is updated, the corresponding command is simultaneously written to the corresponding stream.

Growing community of inventors

Grand Rapids, MI, United States of America

Peter Grayson