Laser interferometry positions disk drive heads

Increasing the storage capacity of computer disk drives means increasing the density of data tracks, which requires more accurate positioning of the drive`s read/write heads. Because heads are positioned with voice-coil-motor (VCM) actuators, specialized techniques are required to place reference positioning information on the disk surface to allow the heads to follow each track. These techniques include closed-loop feedback systems to keep the recording head centered on the data track.

Dec 1st, 1994

Increasing the storage capacity of computer disk drives means increasing the density of data tracks, which requires more accurate positioning of the drive`s read/write heads. Because heads are positioned with voice-coil-motor (VCM) actuators, specialized techniques are required to place reference positioning information on the disk surface to allow the heads to follow each track. These techniques include closed-loop feedback systems to keep the recording head centered on the data track.

ARPA-sponsored team to develo¥uncooled focal-plane-array silicon detectors

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