Storage module and method for analysis and disposition of dynamically tracked read error events
First Claim
1. A method for analyzing a read error event, the method comprising:
- performing the following in a storage module having a memory partitioned into a plurality of blocks, wherein each block comprises a plurality of pages;
reading a page of data stored in the memory;
determining a read error event for the page of data; and
determining whether a scope of the read error event in the memory is limited to the page or covers a block that includes the page by;
determining bit error rates for other pages of the block;
determining a composite bit error rate for the block based on the bit error rates for the other pages; and
comparing a bit error rate for the page with the composite bit error rate for the block;
wherein the scope is limited to the page when the bit error rate for the page is greater than the composite bit error rate for the block, and wherein the scope covers the block when the composite bit error rate for the block is greater than the bit error rate for the page.
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Accused Products
Abstract
A method for analyzing a read error event is provided comprising reading a page of data stored in memory, determining a read error event for the page of data, and identifying a scope of the read error event in the memory. In another embodiment, a method for performing a preliminary read error recovery is provided comprising reading a first data unit from memory and identifying a bit error rate for a first data unit with a correction engine, determining that the bit error rate is above a threshold, accessing a data structure including entries identifying data units and read error event information associated with the data units, identifying a second data unit in an entry that matches the first data unit, and performing a preliminary read error recovery process on the first data unit using the information in the entry to reduce the bit error rate below the threshold.
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Citations
16 Claims
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1. A method for analyzing a read error event, the method comprising:
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performing the following in a storage module having a memory partitioned into a plurality of blocks, wherein each block comprises a plurality of pages; reading a page of data stored in the memory; determining a read error event for the page of data; and determining whether a scope of the read error event in the memory is limited to the page or covers a block that includes the page by; determining bit error rates for other pages of the block; determining a composite bit error rate for the block based on the bit error rates for the other pages; and comparing a bit error rate for the page with the composite bit error rate for the block; wherein the scope is limited to the page when the bit error rate for the page is greater than the composite bit error rate for the block, and wherein the scope covers the block when the composite bit error rate for the block is greater than the bit error rate for the page. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for performing a preliminary read error recovery, the method comprising:
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performing the following in a storage module having a memory and a correction engine; reading a first data unit from the memory and identifying a bit error rate for the first data unit with the correction engine; determining that the bit error rate is above a threshold; accessing a data structure including entries identifying data units and read error event information associated with the data units; identifying a second data unit in an entry that matches the first data unit; performing a preliminary read error recovery process on the first data unit using the information in the entry to reduce the bit error rate below the threshold; and determining to perform a primary read error recovery process on the data in response to the bit error rate being above the threshold, wherein the storage module accesses the data structure, identifies the second data unit in the entry, and performs the preliminary read error recovery process before performing the primary read error recovery. - View Dependent Claims (15, 16)
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14. A method for performing a preliminary read error recovery, the method comprising:
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performing the following in a storage module having a memory and a correction engine; reading a first data unit from the memory and identifying a bit error rate for the first data unit with the correction engine; determining that the bit error rate is above a threshold; accessing a data structure including entries identifying data units and read error event information associated with the data units; identifying a second data unit in an entry that matches the first data unit; performing a preliminary read error recovery process on the first data unit using the information in the entry to reduce the bit error rate below the threshold; and determining to perform a primary read error recovery process on the data in response to the bit error rate being above the threshold, wherein the storage module accesses the data structure, identifies the second data unit in the entry, and performs the preliminary read error recovery process before performing the primary read error recovery; wherein the storage module does not perform the primary read recovery process when the preliminary read recovery process reduces the bit error rate below the threshold.
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Specification