Non-volatile memory and method with non-sequential update block management

a non-volatile, block management technology, applied in the direction of memory adressing/allocation/relocation, instruments, fault response, etc., can solve the problems of limited range of logical units and scattering of memory units that the updates are obsolete, and achieve good ecc and extra reliability
US20050141312A1Inactive Publication Date: 2005-06-30SANDISK TECH LLC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SANDISK TECH LLC
Publication Date
2005-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

In a nonvolatile memory with block management system that supports update blocks with non-sequential logical units, an index of the logical units in a non-sequential update block is buffered in RAM and stored periodically into the non-volatile memory. In one embodiment, the index is stored in a block dedicated for storing indices. In another embodiment, the index is stored in the update block itself. In yet another embodiment, the index is stored in the header of each logical unit. In another aspect, the logical units written after the last index update but before the next have their indexing information stored in the header of each logical unit. In this way, after a power outage, the location of recently written logical units can be determined without having to perform a scanning during initialization. In yet another aspect, a block is managed as partially sequential and partially non-sequential, directed to more than one logical subgroup.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 750,155, filed on Dec. 30, 2003.FIELD OF THE INVENTION

[0002] This invention relates generally to non-volatile semiconductor memory and specifically to those having a memory block management system with efficient handling of update data in a block. BACKGROUND OF THE INVENTION

[0003] Solid-state memory capable of nonvolatile storage of charge, particularly in the form of EEPROM and flash EEPROM packaged as a small form factor card, has recently become the storage of choice in a variety of mobile and handheld devices, notably information appliances and consumer electronics products. Unlike RAM (random access memory) that is also solid-state memory, flash memory is non-volatile, and retaining its stored data even after power is turned off. Also, unlike ROM (read only memory), flash memory is rewritable similar to a disk storage device. In spite of the higher ...

Claims

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