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1. (US5835935) Method of and architecture for controlling system data with automatic wear leveling in a semiconductor non-volatile mass storage memory

Office : United States of America
Application Number: 08527484 Application Date: 13.09.1995
Publication Number: 5835935 Publication Date: 10.11.1998
Grant Number: 5835935 Grant Date: 10.11.1998
Publication Kind : A
IPC:
G11C 16/06
G06F 12/06
G11C 16/02
G06F 3/06
G06F 12/00
G11C 16/10
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
06
Auxiliary circuits, e.g. for writing into memory
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
12
Accessing, addressing or allocating within memory systems or architectures
02
Addressing or allocation; Relocation
06
Addressing a physical block of locations, e.g. base addressing, module addressing, address space extension, memory dedication
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
3
Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
06
Digital input from, or digital output to, record carriers
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
12
Accessing, addressing or allocating within memory systems or architectures
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
06
Auxiliary circuits, e.g. for writing into memory
10
Programming or data input circuits
CPC:
G06F 3/0601
G06F 2003/0694
G06F 2212/2022
G11C 16/102
Applicants: Lexar Media, Inc.
Inventors: Estakhri Petro
Assar Mahmud
Reid Robert Alan
Iman Berhanu
Agents: Hamrick Claude A. S.
Donnelly Oppenheimer W.
Imam Maryam
Priority Data:
Title: (EN) Method of and architecture for controlling system data with automatic wear leveling in a semiconductor non-volatile mass storage memory
Abstract: front page image
(EN)

A semiconductor non-volatile mass storage memory is partitioned into user files and system files. The system files partition is further subdivided into clusters, each cluster having a plurality of sectors. Each cluster stores the system file for a single predetermined LBA. As the information within the LBA is changed, the new information is written into an empty sector within the cluster. Once the cluster is filled, the system either erases for recycling the cluster or preferably locates an empty cluster and repeats the process with that new cluster. Once all the clusters are filled, all clusters containing old data are erased for recycling.