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Partial Response Maximum Likelihood

   Also found in: Acronyms, Wikipedia 0.06 sec.
(storage)Partial Response Maximum Likelihood - (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".


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The first successful implementation of Partial Response Maximum Likelihood (PRML) channel encoding technology on linear tape drive platforms, VR2 can increase native capacity and native data transfer rate performance of existing linear tape technologies by as much as 50 to 100 percent without requiring any changes in tape path design, recording heads and/or media.
Overland Licenses VR2 Technology to Quantum by Business Wire
The ST L6361 integrates a Partial Response Maximum Likelihood (PRML) read channel path based on an advanced 16 state Viterbi detector and coding scheme to enhance signal-to-noise (SNR) performance.
STMicroelectronics Announces Fully Functional CMOS Read Channel for ... by Business Wire
MRX head technology, 33 MB/sec internal transfer rate with Ultra DMA/33 Mode-2, Partial Response Maximum Likelihood (P.
IBM announces record-breaking 8.4-gigabyte desktop PC hard drive by Business Wire
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