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Placing the controller on the drive gives IDE drives built-in reliability because data encoding, from digital to analog is performed directly on the drive in a tight, noise-free environment. This occurs in the case, for example of SCSI drives, as well.
The timing-sensitive analog information does not have to travel along ribbon cables that may pick up noise and insert propagation delays into the signals as it happened in older MFM and RLL controllers. The integrated configuration allows for increases in the clock rate of the encoder, as well as, because of this, the storage density of drive.
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