As the areal-recording densities and transfer rates of magnetic storage products are pushed ever higher, the signal output of these products inevitably reduces and noise bandwidth increases. The result is a drop in signal-to-noise ratio with each new product generation. Because of this phenomenon, each new product generation requires a countermeasure to restore the signal-to-noise ratio to an acceptable level. Such a restoration typically comes from improvements to replay-head or media output. For the DDS4 generation of 4-mm DAT tape drive, Hewlett-Packard developed a novel data detector, which proved to be a key piece of enabling technology for this product. The same detector will also form the backbone of the next-generation Hewlett-Packard DDS5 tape drive.
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