Cylinder: When a track of the same diameter is cut on multiple layers or "Platters" of the HDD.

Cylinder: When a track of the same diameter is cut on multiple layers or "Platters" of the HDD.

Track: The grooves that are cut into the hard disk, where data is stored on a hard disk drive.

A hard disk is a sealed unit containing a number of platters in a stack. Hard disks may be mounted in a horizontal or a vertical position. In this description, the hard drive is mounted horizontally.

Heads: The leads that the Hard Disk Drive uses to read the geometry of a hard disk.

Heads: The leads that the Hard Disk Drive uses to read the geometry of a hard disk.

Geometry: The physical layout of data on a storage device, such as a cassette tape, or a Hard Disk Drive.

Geometry: The physical layout of data on a storage device, such as a cassette tape, or a Hard Disk Drive.

Voice Coil: The coil that moves at certain frequencies. This is the device that makes sounds come out of speakers.

Voice Coil: The coil that moves at certain frequencies. This is the device that makes sounds come out of speakers.

Stepper Motor: The motor that turns a Hard Disk Drive. This motor rotates incrementally and can be controlled without a feedback sensor.

Stepper Motor: The motor that turns a Hard Disk Drive. This motor rotates incrementally and can be controlled without a feedback sensor.

Partial Response Maximum Likelihood: This is a method of identifying varying signals as changes in a variable.

Partial Response Maximum Likelihood: This is a method of identifying varying signals as changes in a variable.

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