Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Xiaoying Li

Aajna Karki

Ji-Hyun In

Hongmei Xie

Dhanunjaya Rao Gorrle

Oleg Kragel

Yosief Ataklti

A storage device optimizes block closure in a memory device and maintains quality of service provided to a host device. The storage device receives commands from a host device and writes host data to a block in the memory device in a first state. When the storage device has not received a host write command for a host write idle time period, the storage device transitions to a second state, performs background operations at a first rate, and writes data to the block. When the storage device has not received a host read command or a host write command for a complete idle time period, the storage device transitions to a third state based, performs background operations at a second rate, and writes data to the block. The storage device uses the transitions between the states to maintain quality of service provided to the host device.

Quality of service (QOS) optimized open block closure

A data storage device for providing zone management optimization may include memories including staging memory areas (e.g., single level cells) and destination memory areas (e.g., quad-level cells). The destination memory areas may include memory regions (e.g., zones). A controller may be configured to receive data from a host system, write the data initially to the staging memory areas, receive a region full indication for a first memory region. In response to receiving the region full indication, the controller may add a first entry corresponding to the first memory region to a double linked list. The controller may select, using a region selection randomization method, a second entry corresponding to a second memory region, and folds a second data to the second memory region. The first data may be associated with the first memory region and the second data may be associated with the second memory region.

Folding zone management optimization in storage device

Aspects of a storage device including a memory and a controller are provided. In certain aspects, the controller may determine that data stored on a first block satisfies a threshold data-error condition, the data comprising invalid data and valid data. For example, the first block may have a high ratio of valid data to invalid data that satisfies or exceeds a threshold value. In certain aspects, the controller may determine a close block boundary associated with the first block, wherein the close block boundary is configured to bifurcate the first block into a first portion and a second portion, wherein the first portion comprises the data. For example, the controller may determine a boundary defined by a data length, an indirection mapping unit, a physical program boundary, etc.

Open block relocation

A data storage device includes a memory device and a controller coupled to the memory device. The data storage device supports zoned namespace. The controller is configured to maintain a zone timestamp table that includes a corresponding timestamp for each zone and add a timestamp to each garbage collection block of the memory device. The controller is further configured to scan a garbage collection block from a last physical block address (PBA) entry to a first PBA entry, determine a zone timestamp for the scanned PBA entry, and compare the zone timestamp to a timestamp of the garbage collection block. The controller is further configured to create and maintain a zone timestamp table and create and maintain a zone based defragmentation table.

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Fremont, CA, United States of America

Xiaoying Li