Method and system for accessing logical data blocks in a storage system that includes multiple memories which are connected to at least one common bus

• Main Author: WITTENBURG, JENS PETER
• Format: Patent
• Language: English; French; German
• Published: 18.10.2006
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

For recording or replaying in real-time digital HDTV signals very fast memories are required. For storage of streaming HD video data NAND flash memory based systems can be used. However, NAND flash memories have a slow write access, and they have unmasked production defects. Erase operations can be carried out on complete flash-blocks only, and defect flash-blocks must not be used by the file system. The invention uses logical file system blocks which are larger than the physical data blocks: a logical file system block is defined as the combination of one flash-block from each flash memory of the memory system. In addition, to each memory a block indirection table (IRTBL) is assigned in order to mask physical defects in storage cells of said NAND flash memories, and to map logical data block address values (LADD) to non-defect physical block address values (PHADD).