Partial Response Maximum Likelihood

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(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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No references found			SDLT drives whose base is LGMR technology will utilize the Partial Response Maximum Likelihood from its 1st version through the compatible product''s whole roadmap. Highly Durable SDLT Tape by Tape4backup / Computers and Internet community It says the new technology in SuperDLT, including laser guided magnetic recording, and advanced PRML partial response maximum likelihood technology, will give SuperDLT a full decades worth of increased performance and compatibility with no further substantial technical changes to come. Quantum Ships SuperDLT Evaluation Units to OEMs by Computergram International 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			partial fractions partial function partial key partial molal quantity partial molar volume partial node partial nucleate boiling partial obscuration partial occupancy partial order partial ordering partial partition partial payment partial pediment partial penetration partial plane partial pluton partial potential temperature Partial Pressure partial pressure suit partial prestressing partial product partial recursive function partial regression coefficient partial release Partial Response Maximum Likelihood partial sum Partial System partial thermoremanent magnetization partial tide partial tone partial wetting partial-duration series partial-height partition partial-pressure maintenance partial-read pulse partial-response maximum-likelihood technique partial-select output partially balanced incomplete block design partially ionic bond partially ordered set partially populated board participation crude Participle Particle Particle Acceleration, Collective Methods of Particle Accelerator particle beam particle board Particle Counter particle counting			Partial Rank Correlation Coefficient Partial Reconfiguration Partial Reconfiguration Cost Calculator Partial recursive function Partial Redemption Partial Redemptions Partial redundancy elimination Partial Redundant Distributed Meta Partial reflector Partial reflector Partial reflector partial reformate fuel cell partial regression coefficient partial reinforcement Partial Reinforcement Extinction Effect partial release partial release Partial Releases Partial Releases partial remission partial remission Partial Resistance Partial Response Partial Response Partial Response - Maximum Likelihood Sequence Detection Partial Response Action Area Partial Response Channel Partial Response Class 5 Partial Response Coding Partial Response Fading Channels Partial Response Maximum Likelihood Partial Response Viterbi Detector Partial Restoration of Historic Flow Partial Retention of Diatomic Differential Overlap Partial Reversible Airway Obstruction Partial Risk Guarantee Partial Risk Guarantee Facility partial root amputation Partial Rotator Cuff Tear Partial Route Calculation Partial Run-Time Reconfiguration Partial Sampling Minimum Mean Squared Error Partial Scan Results Partial Sciatic Nerve Injury Partial Sciatic Nerve Transection Partial Sciatic Transection Partial Season Ticket Plan Partial Secondarily Generalized Seizures Partial Secondary Generalized Epilepsy partial seizure partial seizure partial seizure partial seizure Partial Seizures Followed by Epileptic Spasms Partial Semantics Partial Sequence Number Packet partial shadowing partial similarity

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