Abstract

To make higher density on optical disk, a new recording method—two dimensional recording—which can increase the tract-density rather than the linear density was proposed. The performance of this method on increasing density is estimated by the simulation and confirmed by measuring the read-out signal. Consequently, it is clarified that this method can attain more than twice the areal density independently and realize the density of 2.2 Gbit/squared-inch which is 8 times as large as that of first generation using 680 nm laser diode.

© 1995 IEEE