Stmicroelectronics S.r.l.

Stmicroelectronics Pvt. Ltd.

Skhynix Inc.

Stmicroelectronics International N.v.

Sudeep Biswas

Angelo Di Sena

Domenico Manna

A restoring operation of a storage device based on a flash memory. In an embodiment, a storage device emulates a logical memory space (including a plurality of logical blocks each one having a plurality of logical sectors), which is mapped on a physical memory space of the flash memory (including a plurality of physical blocks each one having a plurality of physical sectors for storing different versions of the logical sectors). A method may detect a plurality of conflicting physical blocks for a corrupted logical block and determines a plurality of validity indexes. One or more of the conflicting physical blocks are selected according to the validity indexes. The selected conflicting physical blocks are then associated with the corrupted logical block. At the end, each one of the non-selected conflicting physical blocks is discarded.

Restoring storage devices based on flash memories and related circuit, system, and method

A solution for managing a storage device based on a flash memory is proposed. A corresponding method starts with the step for mapping a logical memory space of the storage device (including a plurality of logical blocks) on a physical memory space of the flash memory (including a plurality of physical blocks, which are adapted to be erased individually). The physical blocks include a set of first physical blocks (corresponding to the logical blocks) and a set of second&#x2014;or spare&#x2014;physical blocks (for replacing each bad physical block that is unusable). The method continues by detecting each bad physical block. Each bad physical block is then discarded, so to prevent using the bad physical block for mapping the logical memory space.

Garbage collection in storage devices based on flash memories

A wear leveling solution is proposed for use in a storage device based on a flash memory. The flash memory includes a plurality of physical blocks, which are adapted to be erased individually. A corresponding method starts with the step for erasing one of the physical blocks. One of the physical blocks being allocated for storing data is selected; this operation is performed in response to the reaching of a threshold by an indication of a difference between a number of erasures of the erased physical block and a number of erasures of the selected physical block. At least the data of the selected physical block being valid is copied into the erased physical block. The selected physical block is then erased.

Wear leveling in storage devices based on flash memories and related circuit, system, and method

A solution for restoring operation of a storage device based on a flash memory is proposed. The storage device emulates a logical memory space (including a plurality of logical blocks each one having a plurality of logical sectors), which is mapped on a physical memory space of the flash memory (including a plurality of physical blocks each one having a plurality of physical sectors for storing different versions of the logical sectors). A corresponding method starts by detecting a plurality of conflicting physical blocks for a corrupted logical block (resulting from a breakdown of the storage device). The method continues by determining a plurality of validity indexes (indicative of the number of last versions of the logical sectors of the corrupted logical block that are stored in the conflicting physical blocks). One ore more of the conflicting physical blocks are selected according to the validity indexes. The selected conflicting physical blocks are then associated with the corrupted logical block. At the end, each one of the non-selected conflicting physical blocks is discarded.

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Delhi, India

Sudeep Biswas