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With the advent of IDE (Integrated Drive Electronics), manufacturers started including the drive controller in the same housing as the hard drive itself. This made for faster access times as well as fewer issues with moving a drive from one controller to another (as with MFM, RLL, and SCSI drives)

The controller acts as an interpreter, getting requests from the computer and taking control of physically moving the drive heads, controlling the spindle speed, self-diagnosis (S.M.A.R.T.) and so forth.

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Q: What is the hard drive controller on a circuit board inside th edrive house?
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