Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Shivam Mishra

Hitesh Golechchha

Shakti Bhatnagar

Akhilesh Yadav

Pradeep Seetaram Hegde

Early detection of Room Temperature Data Retention (RTDR) phenomena in programmed metablocks of data storage devices. In one embodiment, a memory controller includes a memory interface configured to interface with a non-volatile memory and a controller. The controller is configured to program a metablock of the non-volatile memory. Programming the metablock includes assigning the metablock to one of a plurality of thermal region tags ('TRTs') associated with a respective one of a plurality of thermal regions. Each TRT is associated with a respective set of read parameters. The controller is further configured to perform a periodic TRT update to detect a RTDR phenomena associated with the metablock. In response to determining that the threshold associated with the detection of a RTDR phenomena has been exceeded, the controller reassigns the metablock to a different one of the TRTs.

Early detection of room temperature data retention phenomena

A system, apparatus, and method for dynamic allocation of sub-blocks. First, a non-volatile memory array receives a set of write commands. The non-volatile memory array comprises multiple memory dies organized into metablocks. The metablocks are configured to span two or more memory dies. A stream manager determines a workload type for the set of write commands. A block allocation manager selects a target storage block to receive the set of write commands based on the workload type. The selected target storage block is configured to receive data blocks for the workload type and the block allocation manager directs the set of write commands to the target storage block.

Dynamic allocation of sub blocks

A storage device may include a controller performing non data word line (NDWL) maintenance in sub block mode (SBM). The NDWL maintenance in SBM can include proactive select gate drain (SGD) detection and phased SGD correction. For example, when a block reaches a PE cycle threshold value, SGD phased correction occurs upon detection of an error, by determining whether a sister sub block of the selected block contains data. If the sister sub block contains data, the data is transferred from the sister sub block, and then the block and sister sub block undergo correction for NDLW maintenance.

Growing community of inventors

Bengaluru, India

Shivam Mishra