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US 7,405,678 B2Granted
Method of retrieving data from a storage device using a recovered read-back parameter
AssigneeInternational Business Machines Corporation
InventorGiovanni Cherubini
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Abstract
A storage device comprising a modulation encoder and decoder, an error-correction encoder and decoder, and a metric computation module. The modulation encoder and decoder provide a modulation code for data stored on the storage device. The error-correction encoder and decoder provide an error-correcting code for data to be written on the storage device. The metric computation module is coupled with the modulation decoder to compute conditional probabilities using recovered read-back channel parameters of the storage device.
Claims8
A method of data retrieval from a storage device, the method comprising:
- obtaining samples of a read-back signal from the storage device;
- computing conditional probabilities of the read-back signal samples using at least one recovered read-back channel parameter of the storage device;
- performing decoding of a modulation code for data stored on the storage device using the conditional probabilities to obtain a posteriori probabilities;
- and
- performing decoding of an error-correcting code in which the data is is stored on the storage device using the posteriori probabilities to obtain an estimate of the recorded message.
2 more elements
Dependencies are inferred from the claim text.