25 Gbyte read-only memory disk by injection-compression molding process

We studied the feasibility of fabricating a disk replica at a recording cap acity of 25 Gbytes by a conventional injection molding process. This work i s the first attempt at fabricating a disk replica using a stamper recorded by an electron beam recorder, The bottom jitter value of the injection-mold ed disk was 9.3% when using a conventional equalizer and 6.5% when using an additional limit equalizer. These values were highly similar to those of t he photo-polymer (2P) disk. The residual error on the axial tracking of the injection-molded disks was smaller than that of the 2P disk, and the resid ual error on the radial tracking was almost the same as that of the 2P disk .