It is necessary to reduce the mastering noise, particularly for a groove-recording disc such as the Blu-ray disc. Despite using a deep-UV (DUV) laser, which is the leading method of forming a groove ...

Blade micrometers are available that can measure the external groove with high accuracy, but this part doesn’t need that accuracy, and I find spring calipers to be quicker. For the internal features, ...

This paper studies the air bearing features on discrete track media by very small mesh size. The mesh size is only 5 nm, and it allows to study the air bearing characteristics of a small square pad ...