Samsung Electronics Co., Ltd.

Seungryong Jang

Chanha Kim

Gyeongmin Nam

A storage device includes a memory device including a first memory region, a second memory region, and a third memory region, the first memory region having a lowest bit-density relative to the second memory region and the third memory region, a second memory region having a medium bit-density relative to the first memory region and the third memory region, and a third memory region having a highest bit-density relative to the first memory region and the second memory region; and a controller configured to control the memory device The controller is configured to distribute data received from a host to the first to third memory regions based on attributes of the data, to determine a current state based on a data distribution amount for each of the first to third memory regions and a respective size of each of the first to third memory regions, and to perform an action of increasing or decreasing a size of the second memory region under the current state based on a reinforcement learning result for mitigating a reduction in lifespan of the third memory region.

Storage device and operation method thereof

Provided are a storage device, a storage controller, and an operating method of the storage controller. The storage device according to the inventive concept includes a non-volatile memory and a storage controller. The non-volatile memory includes a plurality of memory blocks, each memory block includes physical units having different retention strengths due to process variations, and the retention strengths respectively correspond to times that physical units retain data before respective reclaim operations for the physical units. The storage controller receives a write request and data from a host, selects a first physical unit based on hotness of data and retention strengths, and controls the non-volatile memory to write data to the first physical unit.

Storage devices, storage controllers, and operating methods of storage controllers

A storage device including: a memory device including memory blocks having different bit densities; and a controller, the controller including: a memory to store a logical address list including a number of recently received logical addresses and a hotness table including a hotness of each of the logical addresses in the list; and a processor to receive a write command, a latest logical address and data, to update a hotness of the latest logical address in the hotness table, to insert the latest logical address into the logical address list, and to control the memory device to program the data into one of the memory blocks depending on whether the hotness of the latest logical address exceeds a threshold value, the hotness of the latest logical address being updated based on how long ago a logical address the same as the latest logical address was received.

Storage device configured to update hotnesses of received logical addresses and a method of operating the storage device

A storage device includes a memory device including a first memory region having a lowest bit density, a second memory region having a medium bit density, and a third memory region having a highest bit density, and a controller configured to control the memory device. The controller is configured to determine data from a host as being any one of hot data, warm data and cold data, is configured to store the hot data in the first memory region, is configured to store the warm data in the second memory region, is configured to store the cold data in the third memory region, is configured to select a source block of first memory blocks included in the first memory region, is configured to select destination blocks in each of the second and third memory regions, and is configured to migrate each piece of unit data stored in the source block to one of the destination blocks according to a degree of hotness of each piece of the unit data.

Storage device including regions of different densities and operation method thereof

Storage devices and an operating method of a storage controller configured to control storage devices. For example, the storage device may include a non-volatile memory and a storage controller. The non-volatile memory includes a first block and a second block, the first block including first memory cells each storing N-bit data, and the second block including second memory cells each storing M-bit data. During a read reclaim operation on the first block, the storage controller determines read hot data stored in the first block and writes the read hot data to the second block. The storage controller may select a first word line corresponding to a first page in which a number of error bits is equal to or greater than a threshold value and determine data stored in a page corresponding to a second word line adjacent to the first word line as the read hot data.

Storage devices and operating methods of storage controllers

A controller includes a central processing unit (CPU) configured to insert a latest received logical address, received together with a write command and data from a host, into a logical address list; a hotness determining circuit configured to assign a maximum weight to the latest received logical address, decrease weights of received logical addresses included in the logical address list by a decay factor, and sum weights of the received logical addresses having values, equal to a value of the latest received logical address, to determine hotness of the latest received logical address; and a parameter adjustment circuit decreasing a magnitude of the decay factor based on the repeatability index of the received logical addresses included in the logical address list, wherein the CPU is configured to control the memory device to store the data in one of the memory regions based on the hotness.

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Gyeonggi-do, South Korea

Seungryong Jang