Patterned medium and method of manufacturing the same
View Patent ↗A patterned medium and a method of manufacturing the same are provided. The patterned medium includes a data region having a plurality of recording dots arrayed along a plurality of tracks; and a non-data region comprising a part of the patterned medium other than the data region, the non-data region having a plurality of pattern marks. The method includes depositing an aluminum layer on a base substrate; depositing a photo-resist on the aluminum layer; forming a pattern on the photo-resist using a lithography process; forming a fine pattern by forming a plurality of cavities on a portion of the aluminum layer which is exposed through the photo-resist; removing the photo-resist; forming a mold pattern; imprinting the mold pattern on a media substrate to form cavities on the media substrate; and filling the cavities with a recording material.
1. A patterned medium comprising:
a data region having a plurality of recording dots arrayed along a plurality of tracks, wherein each recording dot has an aspect ratio less than 2:1; and
a non-data region comprising a part of the patterned medium other than the data region, the non-data region having a plurality of pattern marks having an aspect ratio greater than 2:1, wherein both aspect ratios are the relative ratio between a longitudinal length and a lateral length of the respective dot or mark,
wherein each of the longitudinal length and the lateral length is parallel to a plane of the patterned medium.
2. The patterned medium of claim 1 , wherein the recording dots and the pattern marks have a polygonal shape.
3. The patterned medium of claim 1 , wherein the non-data region comprises:
a plurality of servo patterns extending in a radial direction crossing the plurality of tracks; and
a plurality of track separation patterns formed between the plurality of tracks, wherein the plurality of track separation patterns are parallel with the tracks.
4. The patterned medium of claim 3 , wherein the plurality of servo patterns are arrayed in a plurality of servo regions extending from a center hole to the outermost circumference of the patterned medium in a radial direction, the plurality of servo regions spaced apart from each other by a certain angle.
5. The patterned medium of claim 1 , wherein a surface roughness difference between the recording dots of the data region and the pattern marks of the non-data region is less than 50 Å.
6. The patterned medium of claim 1 , wherein the plurality of recording dots of the data region are formed through a fine patterning process having resolution less than a few tens of nano-meter and the pattern marks of the non-data region are formed through a lithography process.
7. The patterned medium of claim 6 , wherein the fine patterning process is performed by an Anodic Aluminum Oxidation process or a block copolymer process.
8. The patterned medium of claim 1 , wherein the pattern marks are formed between the recording dots within each data region.