NAND Flash Pre-Boot Data Redundancy Across IC Dies

The patent implements redundant copying of pre-boot information across multiple NAND flash memory devices. Each device stores a copy of the critical boot data, and the system maintains a mapping of which devices contain valid copies. This copying strategy ensures that if one device fails or develops defects, the system can retrieve pre-boot information from another device, thereby maintaining data reliability while utilizing NAND flash's high storage capacity.

The patent implements a self-managing redundancy system where the boot manager automatically maintains a mapping of pre-boot information locations across multiple devices. The system autonomously tracks which devices contain valid copies and can retrieve information without manual intervention. This self-service approach handles the complexity of managing multiple redundant copies automatically, making the increased device complexity transparent to the user while maintaining high storage reliability.

The patent prepares for potential read disturbances and defects by implementing redundant copies of pre-boot information stored beforehand in multiple NAND flash devices. The boot manager maintains a mapping of these copies and can select valid copies for retrieval. This beforehand cushioning strategy compensates for the inherent reliability issues of NAND flash during boot operations, allowing the system to use integrated NAND storage while maintaining bootup reliability equivalent to traditional NOR flash solutions.