US Patent 11640371 Snapshot management in partitioned storage

The present disclosure generally relates to a storage snapshot management system. When updated data is written to the memory device, rather than rewriting all of the data, only the updated data is written to a new namespace. A snapshot of the new namespace indicates which LBAs in the new namespace contain data. New namespaces are added each time data is updated. When the updated data is to be read, the data storage device reads the updated LBA from the new namespace, and also gathers the non-updated data from the previous namespace. Eventually, the number of namespaces for the data reaches a threshold, and thus some namespaces need to be evicted. To evict a namespace, the updated data in the namespace is moved to a different namespace, or the non-updated data is moved to a namespace that contains updated data. In either case, the now unused namespaces are evicted.