Sandisk Technologies Inc.

Western Digital Technologies, Inc.

Narendhiran Chinnaanangur Ravimohan

Muralitharan Jayaraman

Vithya Kannappan

Meenakshi C

Ramanathan Muthiah

Ramkumar Ramamurthy

Abhijeet Manohar

Michael Lavrentiev

Balakumar Rajendran

Saranya Nedunchezhiyan

Yehuda Hahn

Arun Thandapani

Sivaraj Velusamy

Ankit Gupta

Krishnamurthy Dhakshinamurthy

Rohit Sathyanarayan

Abhinand Amarnath

Bala Siva Kumar Narala

Idan Alrod

Alan David Bennett

Bhavin Odedara

Vijay Sivasankaran

Lovish Singla

Jayanth Mysore Thimmaiah

Srikanth Bojja

Balaji Thraksha Venkataramanan

Eyal Widder

Rampraveen Somasundaram

Anamika Choudhary

Aneesh Puthoor

Satya Kesav Gundabathula

Indu Kumari

Kavya Bathula

Vithya Mariappan

Sai Revanth Reddy Chappidi

Deepak Yadav

Harvijay Singh

Chappidi Sai Revanth Reddy

Bhagyashankar Muthu Kumaresan

Anil Kumar Thadi Suryaprakash

Ajay Dhingra

Ninad Walvekar

Pranesh Babykannan

A data storage device tracks information about the ages and read counts of blocks of memory, which are indicative of data retention and read disturb issues, respectively. The data storage device uses a machine-learning model to predict which blocks in the memory are likely to contain errors based on the tracked information, and a read scrub operation is performed only on those blocks. Limiting the number of blocks that are read scrubbed reduces read amplification and reduces the time required for the read scrub process.

Data storage device and method for read scrub with reduced read amplification

In one embodiment, a data storage device comprises a memory and one or more processors. The one or more processors, individually or in combination, are configured to: provide a host with an indication of an amount of data to cache in a memory of the host; receive, from the host, the amount of data for storage in the memory of the data storage device, wherein the host is configured to cache the amount of data in the memory of the host as a secondary copy; and write only a single copy of the amount of data in the memory of the data storage device, wherein the secondary copy stored in the memory in the host is available in an event of a failure to correctly write the single copy in the memory of the data storage device. Other embodiments are provided.

Data storage device and method for application-defined extended data recovery

A data storage device having a flash translation layer configured to handle file-system defragmentation in a manner that substantially avoids physical data movement in a flash memory. In an example embodiment, a memory controller operates to update a logical-to-physical table thereof to change association of physical addresses of sections of user data from being associated with source logical addresses to being associated with destination logical addresses of the host defragmentation requests without moving the user data in the flash memory. Such updates can reduce the number of instances in which the host addresses a non-contiguous logical-address range, which results in a beneficial reduction of the number of input/output commands sent to the data storage device and of the associated processing overhead.

Logical-to-physical mapping for defragmentation of host file system in a data storage device

In solid state memory devices, garbage collection can be a bottleneck in meeting stringent performance requirements of certain hosts that generate a relatively-large amount of data (e.g., hosts that generate video data). With such hosts, the performance drop caused by background garbage collection can result in video recording failures. The memory device and method presented herein performs background operations in such a way as to enhance sustained performance. In general, a counter is maintained that reflects an amount of memory written to by a host, as well as an amount of memory freed by garbage collection operations. Each step of a garbage collection operation can be performed in response to a value of the counter being greater than a threshold for the step such that there is a balance between memory written and memory freed.

Data storage device with balanced background operations and method therefor

A data storage device having a flash translation layer configured to handle file-system defragmentation in a manner that avoids, reduces, and/or optimizes physical data movement in flash memory. In an example embodiment, the memory controller maintains in a volatile memory thereof a lookaside table that supplants pertinent portions of the logical-to-physical table. Entries of the lookaside table are configured to track source and destination addresses of the host defragmentation requests and are logically linked to the corresponding entries of the logical-to-physical table such that end-to-end data protection including the use of logical-address tags to the user data can be supported by logical means and without physical data rearrangement in the flash memory. In some embodiments, physical data rearrangement corresponding to the file-system defragmentation is performed in the flash memory in response to certain trigger events, which can improve the input/output performance of the data-storage device.

Management of host file-system defragmentation in a data storage device

A storage system and method for data-driven intelligent thermal throttling are provided. In one embodiment, the storage system comprises a memory and a controller. The controller is configured to determine a temperature of the memory, estimate a future temperature curve based on the temperature of the memory, and determine a memory throttling delay to apply based on the estimated future temperature curve. Other embodiments are provided.

Storage system and method for data-driven intelligent thermal throttling

Systems and methods are disclosed that enable shared partitions to be created on devices owned and operated by trusted persons (e.g., family or friends). The disclosed devices and methods provide for partitioning of stored devices and designating one or more of the partitions for sharing with other devices. Access to the shared partitions is managed using coded images thereby requiring the devices to be physically close to one another. Consequently, people sharing the storage partitions are required to meet in person to grant access, increasing the chances that the persons know and trust one another.

Accessing shared pariiiions on a storage drive of a remote device

A storage system receives data to be stored in its memory. A controller in the storage system allocates a primary block of the memory to store the data and determines the health of the allocated block. If the controller determines that the allocated block is not healthy enough to reliably store the data, the controller allocates a secondary block to redundantly store the data.

Storage system and method for dynamic allocation of secondary backup blocks

A storage system and method for device-determined, application-specific dynamic command clustering are provided. In one embodiment, the storage system comprises a memory and a controller. The controller is configured to analyze commands received from a host to detect a pattern of a plurality of commands; inform the host of the pattern; receive, from the host, a single command comprising an identifier associated with the plurality of commands; and in response to receiving the single command from the host, executing the plurality of commands. Other embodiments are provided.

Storage system and method for device-determined, application-specific dynamic command clustering

Systems and methods for predictive performance indicators for storage devices are described. The data storage device may process host storage operations and maintenance operations that impact real-time performance. A performance value and corresponding threshold may be determined. Increases in maintenance operations and resulting changes in the performance value may be predicted. When the predicted change in performance value crosses the performance threshold, the host device may be notified.

Predictive performance indicator for storage devices

Systems and methods data storage device performance prediction based on garbage collection resources are described. The data storage device may process host storage operations and determine a valid fragment count parameter for a current or future data block. Based on the valid fragment count parameter a predicted performance value for host storage operations is determined and the host device is notified of the predicted performance value.

Data storage device performance prediction based on valid fragment count

Aspects of a storage device including a memory and a controller are provided which allow for data associated with a deleted file to be recovered from the memory when the data is overwritten by a new file at the same logical address. To locate the data, the controller may identify a logical address associated with the data based on a directory entry associated with a FAT. The controller may determine a physical location of the data associated with the logical address based on one or more control entries in a L2P mapping table, such as a previous control entry in the table. The controller may also determine the physical location based on a hot count associated with the previous control entry. After the physical location is determined, the controller may associate a new logical address with the physical location of the data to recover the deleted file.

Advanced file recovery method for flash memory

A file system in a storage system can store files received from a host in clusters of memory in the storage system. An end portion of a file may not use the entire cluster. As a result, the end clusters of the stored files can contain unused space. A system and method detects the unused space in such clusters and creates a virtual cluster from the unused space.

Storage system and method for detecting and utilizing wasted space using a file system

Devices, methods, and systems for managing temperature dependent failures in a memory device. An erase failure of a memory block is detected, and marked as a grown bad block if the memory device temperature is below a threshold temperature. If the temperature exceeds the threshold temperature, it is determined whether memory cells of the block exceed a first threshold voltage. If the memory cells of the block exceed the first threshold voltage, the block is marked as a potential grown bad block. If the memory cells of the block are below the first threshold voltage, it is determined whether a number of the memory cells of the block exceed a second threshold voltage. If the memory cells of the block are below the second threshold, the block is programmed. If the memory cells of the block exceed the second threshold, the block is marked for error correction and programmed.

Apparatus and method for handling temperature dependent failures in a memory device

Growing community of inventors

Bengaluru, India

Narendhiran Chinnaanangur Ravimohan