1. The address marker, allowing defining the sector beginning at magnetic disk rotation.

2. System for allocating tasks between two actuators servicing the same magnetic disk media in a single disk drive

3. A composition contains abrasive grains, solvent and a fluoride and can be used for accurately texturing a magnetic disk glass substrate.

4. The abrasive compound is suitable for polishing the surface of a glass substrate for an optical disk platter and a magnetic disk platter.

5. The present invention provides a manufacturing method for a magnetic disk-use glass substrate which can sufficiently reduce substrate surface defects by suppressing the remains of washing off abrasive grains.

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