Uncorrectable Error Correction Code (UECC) Marking of L2P Mapping Units
AssigneeSanDisk Technologies LLC
InventorsJing Shi BOOTH, Karin INBAR, Michael Micha YONIN, Dhanunjaya Rao GORRLE
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AssigneeSanDisk Technologies LLC
InventorsJing Shi BOOTH, Karin INBAR, Michael Micha YONIN, Dhanunjaya Rao GORRLE
Estimating the term…
Use of a partial L2P mapping scheme improves costs and uncorrectable byte error rates in large sized SSD when mapping granularity is greater than the basic read unit in NAND. In a L2P table, a mega-fixed logic block address (mFFLBA) may map to a cluster of consecutive FMUs, numbered by JBAs. By special marking in the NAND only the jumbo block addresses (JBAs) in the cluster that have an uncorrectable error, the storage device can avoid mark the all the JBAs associated with the mFFLBA as uncorrectable error correction code (UECC). That is, only the UECC JBAs are indicated as corrupt, while the non-UECC JBAs in the cluster are indicated as good and the user data is not lost. As a result, reliability of the storage device is improved by reducing the defective parts per million (DPPM).
A data storage device, comprising:
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Dependencies are inferred from the claim text.