A pulse testing method and device, a testing apparatus, and a storage medium are disclosed, the pulse testing method includes: performing (S 110) a pulse test on an optical fiber by using a plurality of pulses of different pulse widths respectively to obtain test data; and fitting (120) the test data corresponding to the plurality of pulses of different pulse widths.

An optical information recording medium comprising:

• a disk-shaped substrate; and
• at least a phase change type recording layer stacked on said substrate, wherein said phase change type recording layer is made from material which includes Ge, Ga, Sb and Te, and when α, β, γ and δ represent atomic percentages of Ge, Ga, Sb and Te, and α + β + γ + δ = 100, then α, β, γ and δ satisfy the relations$$\text{0.1 ≤ α ≤ 7,}$$$$\text{1 ≤ β ≤ 9,}$$$$\text{61 ≤ γ ≤ 75,}$$$$\text{22 ≤ δ ≤ 30.}$$

An optical information recording medium comprising a substrate having concentric circular guide groove stores information that indicates a maximum recording linear velocity Vh. A phase change type SbTe recording layer is formed on the substrate having such a composition and thickness that a dislocation linear velocity V satisfies the relation V ≥ Vh x 0.85 in particular for a pulse modulation recording method.