Sandisk Il Ltd.

Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Yonatan Halevi

Arseniy Aharonov

Uri Peltz

Eyal Ittah

Lola Grin

Ehud Cohen

Yehuda Hahn

Rotem Sela

Michael Holtzman

Boris Dolgunov

Yoav Markus

Eran Shen

Avraham Shmuel

Niv Cohen

Mikhael Zaidman

Yossi Bener

Boaz Greenberg

Amir Samuelov

Irit Maor

An illustrative embodiment disclosed herein is an apparatus including a processor having programmed instructions that write data having mixed deletion characteristics sequentially to a plurality of data entries of a first physical erase block (PEB) in intermediate storage. The data having the mixed deletion characteristics includes first data having a first deletion characteristic. The processor has programmed instructions that maintain metadata in a plurality of metadata entries in a log. The metadata corresponds to the data having the mixed deletion characteristics. The processor has programmed instructions that identify, using the log, the first data having the first deletion characteristic and evacuate the first data having the first deletion characteristic to a second PEB in main memory.

Log-based storage for different data types in non-volatile memory

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

A method for data integrity protection includes receiving items of data for storage in a storage medium. The items are grouped into multiple groups, such that at least some of the groups include respective pluralities of the items. A respective group signature is computed over each of the groups, thereby generating multiple group signatures. An upper-level signature is computed over the group signatures. Groups of the items, the group signatures, and the upper-level signature are stored in respective locations in the storage medium.

Optimized hierarchical integrity protection for stored data

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

A method for protection of data includes maintaining a control parameter indicative of a current version of the data. The data is partitioned into multiple segments. Respective signatures of the segments are computed, responsively to the control parameter, the segments and respective signatures forming respective signed input segments, which are stored in a memory. After the signed input segments are stored, a signed output segment is fetched from the memory. The signature of the signed output segment is verified responsively to the control parameter, and the data in the signed output segment is processed responsively to verifying the signature.

Secure overlay manager protection

Growing community of inventors

Petah Tikva, Israel

Yonatan Halevi