Partial Response Maximum Likelihood


Also found in: Acronyms.

Partial Response Maximum Likelihood

(storage)
(PRML) A method for converting the weak analog signal from the head of a magnetic disk drive into a digital signal. PRML attempts to correctly interpret even small changes in the analog signal, whereas peak detection relies on fixed thresholds. Because PRML can correctly decode a weaker signal it allows higher density recording.

For example, PRML would read the magnetic flux density pattern 70, 60, 55, 60, 70 as binary "101", and the same for 45, 40, 30, 40, 45. A peak detector would decode everything above, say, 50 as high, and below 50 as low, so the first pattern would read "111" and the second as "000".
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
Other features are Read-After-Write, PRML (Partial Response Maximum Likelihood), Timed Tracking, proven reliability with an installed base of over 7 million units, and a low cost of ownership--not to mention its availability via a multi-vendor approach to product development and market expansion.
drive products, including Giant Magneto-resistive heads and MEEPRML (Modified Extended Extended Partial Response Maximum Likelihood) read channels.
The EIM houses another key feature: the Advanced Partial Response Maximum Likelihood (PRML) channel.

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