Zoned namespaces in solid-state drives
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.
1. A storage device, comprising:
a media unit, wherein a capacity of the media unit is divided into a plurality of zones, each zone having a writeable capacity for storing data, and wherein the media unit comprises a plurality of dies, each of the plurality of dies comprising a plurality of erase blocks; and
a controller coupled to the media unit, the controller comprising a zone management for storing zone metadata of the plurality of zones, wherein the controller is configured to:
update the zone metadata to recommend to a host device to reset one or more full zones of the plurality of zones;
update the zone metadata to recommend to the host device to transition one or more open zones of the plurality of zones to a full state prior to the one or more zones reaching the writeable capacity;
transition the one or more open zones to the full state; and
update the zone metadata to alert the host device that the one or more open zones have been transitioned to the full state.
2. The storage device of claim 1 , wherein the controller is configured to issue an event to inform the host device that the zone metadata has changed upon updating an attribute in the zone metadata of Reset Full Zone Anticipated, Transition Zone to Full Recommendation, or Controller Transitioned Full Zone.
3. The storage device of claim 1 , wherein the zone metadata is updated with an attribute of Reset Full Zone Anticipated to recommend to the host device to reset the one or more full zones.
4. The storage device of claim 1 , wherein the zone metadata is updated with an attribute of Transition Zone to Full Recommendation to recommend to the host device to transition the one or more open zones to the full state.
5. The storage device of claim 1 , wherein the zone metadata is updated with an attribute of Controller Transitioned Full Zone to alert the host device that the one or more open zones have been transitioned to the full state.
6. The storage device of claim 1 , wherein the controller is further configured to autonomously reset the one or more full zones when data stored in the one or more full zones is no longer valid.
7. The storage device of claim 1 , wherein the controller is further configured to:
update the zone metadata to recommend to the host device to reset the one or more full zones when the one or more full zones are affected by read disturbs or charge leaks; and
update the zone metadata to recommend to the host device to transition the one or more open zones to the full state upon determining the one or more zones are unsuitable to store data.
8. The storage device of claim 1 , wherein each zone of the plurality of zones comprises one or more erase blocks of the plurality of erase blocks.
9. The storage device of claim 1 , wherein the controller transitions the one or more open zones to the full state after a predetermined amount of time has passed after updating the zone metadata to recommend to the host device to transition the one or more open zones to the full state.