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PRMLPartial Response Maximum Likelihood
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DDS-3 also benefited from a significant non-media technology enhancement: the DDS debut of highly efficient Partial Response Maximum Likelihood (PRML) read channel technology, contributing further to increased capacity.
VR2 is the first successful implementation of Partial Response Maximum Likelihood (PRML) channel encoding technology on linear tape drive platforms, and improves code rate efficiency of linear tape drives to more than 99%.
These include Pivoting Optical Servo (POS) that eliminates the need for pre-formatted tape; Magneto-Resistive Cluster heads (MRC) and new high-efficiency Partial Response Maximum Likelihood (PRML) channel that deliver higher data-transfer rates and capacity; Advanced Metal Powder (AMP) media for extremely high data densities; and Positive Engagement, a robust tape-leader-buckling mechanism for high-duty-cycle automated environments.
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