Stable stretched surface recording medium.

摘要

Stretched surface recording disk (SD) 10 comprises an diameters respectively. The SD is annealed twice during annular support 12 having raised annular ridges 42 and 28 at manufacture to relieve stress in the stretched film 14. This its inside and outside diameters 22 and 30 with a base annealing results in SD essentially free from track anisotropy portion 24 in between the two ridges, and an annular and stress distribution anisotropy in the plane of the disk. As recording medium film 14 held in radial tension and a result, data tracks are more stable than in previous SD, stretched across the base portion by adhering the film to track density can be greater, and the SD is generally more attachment surfaces 48 and 36 near the inside and outside reliable.