Patent ID: 6977108

Claim:
A recording medium, comprising: a substrate; and a recording layer formed on the substrate comprising recording track bands, and isolation regions alternately arranged in a track width direction, said isolation regions being formed concentrically or spirally to define limited regions of the recording track bands formed concentrically or spirally and each recording track band comprising recording cells regularly arrayed in a matrix formed of a non-recording material to form plural rows of sub-tracks, wherein said recording medium has a disk shape, wherein the recording cells included in each sub-track are formed apart from each other at a pitch P in the track direction, and wherein nearest neighboring two recording cells, each positioned on adjacent two sub-tracks in the track band, are formed apart from each other at a pitch P/n in the track direction, where 2≦n5, wherein said isolation regions have a width in the track width direction of 20 to 200 nm and are wider in the track width direction than the distance between adjacent sub-tracks.