06081447 is referenced by 339 patents and cites 89 patents.

A mass storage system made of flash electrically erasable and programmable read only memory ("EEPROM") cells organized into blocks, the blocks in turn being grouped into memory banks, is managed to even out the numbers of erase and rewrite cycles experienced by the memory banks in order to extend the service lifetime of the memory system. Since this type of memory cell becomes unusable after a finite number of erase and rewrite cycles, although in the tens of thousands of cycles, uneven use of the memory banks is avoided so that the entire memory does not become inoperative because one of its banks has reached its end of life while others of the banks are little used. Relative use of the memory banks is monitored and, in response to detection of uneven use, have their physical addresses periodically swapped for each other in order to even out their use over the lifetime of the memory.

Title
Wear leveling techniques for flash EEPROM systems
Application Number
759212
Publication Number
6081447
Application Date
March 5, 1999
Publication Date
June 27, 2000
Inventor
Anil Gupta
Irvine
CA, US
Gregory B Thelin
Garden Grove
CA, US
Robert D Norman
San Jose
CA, US
Karl M J Lofgren
Newport Beach
CA, US
Agent
Majestic Parsons Siebert & Hsue
Assignee
SanDisk Corporation
CA, US
Western Digital Corporation
CA, US
IPC
G11C 16/00
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