SYSTEM AND METHOD FOR SOLID STATE DISK FLASH PLANE FAILURE DETECTION
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United States of America Patent
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Issued Date -
Jul 4, 2013
app pub date -
Feb 14, 2012
filing date -
Dec 28, 2011
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Abstract
A system and method for early detection and reporting of an impending NAND Flash device plane failure. Each time that a data unit is retrieved from a NAND Flash array the number of bits in error and the memory location associated with the errors is observed. if the number of bits in error or the error rate for a memory location exceeds a threshold of the number of bits in error per data, retrieval, or number of bits in error per data unit per unit time, a NAND Flash plane failure Patrol Read operation is performed at the memory location, regardless of where in the cycle the Patrol Read function is in a scrub of the overall NAND Flash device. The NAND Flash plane failure Patrol Read is repeated for a number of cycles on the NAND Flash plane in question.
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