Sandisk Technologies Inc.

Minyoung Kim

Minwoo Lee

Sangyun Jung

SeungBeom Seo

YunKyu Lee

In a data storage device, a controller can efficiently allocate a limited cache space to service multiple data streams. In one or more examples, in response to receiving a first read command for a first stream, the controller may respond to read commands for the first stream based on prefetching data for the first stream using buffers. When the controller receives a second read command for a second stream, the controller may respond to read commands based on prefetching data for the first stream and the second stream using the buffers. After receiving the second read command, in response to receiving a number of read commands for the first stream, the controller may cease prefetching data for the second stream using the buffers, and revert to responding to read commands for the first stream based on prefetching data for the first stream using the buffers.

Enhanced read cache for stream switching in storage device

Aspects of a storage device are provided for handling detection and operations associated with an erase block type of the block. The storage device includes one or more non-volatile memories each including a block, and one or more controllers operable to cause the storage device to perform erase type detection and associated operations for single blocks or metablocks. For instance, the controller(s) may erase the block prior to a power loss event, perform at least one read of the block following the power loss event, identify the erase block type of the block in response to the at least one read, and program the block based on the identified erase block type without performing a subsequent erase prior to the program. The controller(s) may also perform metablock operations associated with the identified erase block type. Thus, unnecessary erase operations during recovery from an ungraceful shutdown (UGSD) may be mitigated.

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Suwon, South Korea

Minyoung Kim