Using over provisioning space for selectively storing block parity

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United States of America Patent

PATENT NO 11354190
APP PUB NO 20220050747A1
SERIAL NO

17184422

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Abstract

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Methods and apparatus for storing parity bits in an available over provisioning (OP) space to recover data lost from an entire memory block. For example, a data storage device may receive data from a host device, write the data to a block, and generate a corresponding block parity. The device may then determine a bit error rate (BER) of the block and an average programming duration to write the data written to the block, calculate a probability of the block becoming defective based on the BER and the average programming duration, and comparing the probability of the block to a set of probabilities respectively corresponding to a set of worst-performing blocks in a NVM. Thereafter, the device may write the block parity to an available over provisioning (OP) space in the NVM responsive to the probability of the block being greater than any probability in the set of probabilities.

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Patent Owner(s)

Patent OwnerAddress
SANDISK TECHNOLOGIES INC951 SANDISK DRIVE LEGAL DEP MILPITAS CA 95035

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Reusswig, Philip David Santa Clara, US 13 136
Sehgal, Rohit San Jose, US 43 251
Sharma, Sahil San Jose, US 50 363
Yang, Nian Niles Mountain View, US 80 1141

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