Sandisk Technologies Inc.

Naga Shankar Vadalamani

Nagi Reddy Chodem

Navin Kochar

Ramdas Jayant Singathiya

A storage device may maintain persistent data after converting from firmware associated with a first mode to firmware associated with a second mode. The device receives a firmware package associated with the second mode, determines when the package includes a descriptor, and executes a copy macro in the descriptor to translate a first data structure used in the first mode to the second data structure used in the second mode. When the device receives a commit command and determines that the second data structure is in a volatile memory, the device copies the second data structure to a non-volatile memory. After completing the commit command and power cycling, when the device is being formatted in the second mode, the device reads the second data structure from the non-volatile memory, transfers the second data structure to a persistence module, and formats in the second mode.

Converting a solid-state drive operating in a first mode to another solid-state drive operating in a second mode

A storage device processes deferred unmap operations while maintaining instructions in a write command. A controller in a storage device receives an unmap command and a write command from a host, determines that a logical page in the write command overlaps with a range in the unmap command with deferred unmap operations, and processes the write command. In processing the write command, an L2P translation manager sets a collision bit for the logical page and updates a L2P table. When processing the deferred unmap operations, the controller selects the range and if, based on collision bits in the range the controller determines that there is no overlap between the write command and the range, the controller performs the deferred unmap operations for the range. If the controller determines that there is an overlap, the controller processes the deferred unmap operations to not override the write command.

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Bengaluru, India

Naga Shankar Vadalamani