Sandisk Technologies Inc.

Vered Kelner

Eran Sharon

Idan Alrod

Ariel Navon

Marina Frid

The present disclosure generally relates to improved consolidation in dual-layer FTL. In preparation for the next control sync, the controller will generate a copy the uRegions uHeaders and will continue updating the uLayer uRegion with new uRun entries. After completing the control sync operation, the controller will then select the best consolidation candidate based on comparing the uRegion uHeaders with their copy and determining the uRegion with the maximum uRuns difference or the greatest number of uRun updates in case the uRun updates difference is less than a threshold. The controller then reads the selected mSets from the flash memory to its cache and merges the updated uRuns with the cached mSets.

Efficient consolidation for two layer FTL

The present disclosure generally relates to estimating when data to be written will be read or re-written prior to actually writing the data to the memory device. The estimating can be used to smartly route the data to the appropriate memory location at the writing stage or to evict the data from a hot memory location to a colder memory location. To perform the estimating, typical traces or data may be used as may the metadata of the data. Separating data according to the data 'temperature' (i.e. the expected access time and frequency), and usage to optimize the SLC partition usage has meaningful impact on several storage metrics such as performance and endurance.

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Gan Haim, IL, United States of America

Vered Kelner