Storage Controller Read Retry Sequence Key
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Solution Overview
Problem
Existing storage devices require significant storage space to store the sequence of read biases applied during read retry operations, which can be inefficient.
Innovation Solution
A storage device and its operating method that utilize a controller to perform read retry operations based on a read retry sequence key, determining a sequence of M history read biases to reduce storage space needed for storing the sequence of read biases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage device stores the complete sequence of read biases applied during read retry operations, then the read retry operation can be performed accurately, but the storage space required increases significantly
Solution Approach 1:
The patent extracts only the essential information needed for read retry operations by storing a sequence key that identifies the order of read biases, rather than storing the complete sequence of read bias values. This extraction principle reduces the storage space from storing multiple bias values to storing a single key value that can reconstruct the sequence.
Solution Approach 2:
The patent uses a sequence key as a compact representation or copy of the full read bias sequence. Instead of storing the actual sequence data, a simplified key structure is stored that can be used to reconstruct or identify the sequence, significantly reducing storage requirements while maintaining operational accuracy.
2Volume of stationary object
If a compact representation (sequence key) is used to reduce storage space, then storage efficiency improves, but the complexity of determining the read bias sequence increases
Solution Approach 1:
The patent applies preliminary action by pre-defining and storing the sequence key that encodes the read bias sequence information in a compact form. The key is prepared in advance with a structure that facilitates efficient sequence determination, reducing the computational complexity during actual read retry operations despite the compact representation.
Data Source
AI summary
A storage device may execute a read retry operation on a plurality of memory cells when a failure occurs during a read operation on the plurality of memory cells. The storage device may perform the read retry operation based on M history read biases, and determine a first sequence in which the M history read biases are applied when the read retry operation is performed, based on a read retry sequence key.