Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Sandisk Il Ltd.

Lola Grin

Uri Peltz

Eyal Ittah

Yonatan Halevi

Ehud Cohen

Itay Busnach

Lior Bublil

Alexander Bazarsky

Karin Inbar

Tomer Tzvi Eliash

Michael Micha Ionin

Mahim Raj Gupta

Einat Lev

Avraham Shmuel

Micha Yonin

Lior Avital

Alexei Naberezhnov

Yossi Benner

Irit Maor

Yossi Bener

Boaz Greenberg

A system and apparatus for secure NVM format by pre-erase is disclosed. According to certain embodiments when an NVM does into idle mode, one or more free blocks are serially popped from a free block heap. The free block is then physically erased in an SLC mode, and then pushed to a pre-erase heap. The process is performed in both SLC and TLC partitions, in the TLC partition the block becomes hybrid SLC (HSLC). This process increases a program erase count (PEC) value of the block, maintaining device longevity. When there is a need to use a new block, it is popped from the pre-erase heap. In some cases where there is a need to use a TLC block instead of an HSLC block, an erase operation is used that converts the block from HSLC to TLC, and does not increase a PEC value for the block.

Reduce command latency using block pre-erase

A data storage device includes a memory device and a controller coupled to the memory device. The controller is configured to determine that a power loss event has occurred, determine that one or more blocks are in an erased state, examine a block of the one or more blocks to determine whether the block is a SLC erased block or a TLC erased block, and place the block in a SLC pre-erase heap if the block is the SLC erased block or in a TLC pre-erase heap if the block is the TLC erased block. The controller is further configured to determine a first bit count of page0 for a SLC voltage for the block, determine a second bit count of page1 for a TLC voltage for the block, and classify the block as either a SLC erased block or a TLC erased block.

Block erase type detection using bit count check

A storage device may be configured to copy valid data units from a source memory area to a destination memory area according to a source-to-destination mapping. The source-to-destination mapping may be generated based on a ranking scheme that considers the number of valid data units being stored in each of a plurality of source pages storing the data.

Managing data stored in a nonvolatile storage device

A storage device and method for using a virtual file in a public memory area to access a plurality of protected files in a private memory area are disclosed. In one embodiment, a storage device receives a request from a host for access to a virtual file in the public memory area, wherein the virtual file is associated with a plurality of protected files stored in the private memory area. The storage device responds to the request by selecting and providing the host with access to one of the plurality of protected files stored in the private memory area. The storage device receives an additional request from the host for access to the virtual file and responds to the additional request by selecting and providing the host with access to a different one of the plurality of protected files stored in the private memory area.

Storage device and method for using a virtual file in a public memory area to access a plurality of protected files in a private memory area

In a particular embodiment, a storage device with a memory, a controller, and a host interface has a write-once read-many device configuration. The memory contains a database having entries, each entry for a logical memory address. The memory further contains information for converting each logical memory address to a redirected logical memory address that corresponds to a physical memory location. The controller receives a command specifying a logical memory address and interprets the command based on information extracted from the database. The controller executes the command according to the information.

Handling commands within a write-once read-many storage device configuration

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Netanya, Israel

Lola Grin