Extended PRML (EPRML)
An evolutionary improvement on the PRML design has been developed over the last few years. Called extended
The chief benefit of using EPRML is that due to its higher performance, areal density (or more correctly, the linear component of areal density) can be increased without increasing the error rate. Claims regarding this increase range from around 20% to as much as 70%, compared to “regular” PRML. Those numbers represent a fairly significant improvement.
EPRML has now been widely adopted in the hard disk industry and is replacing PRML on new drives.
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