For achieving a higher density than that of current digital versatile discs
(DVD), a high numerical aperture(NA) and blue wavelength light source is te
sted to increase the areal density. In contrast to this positive effect, th
e coma aberration is doubled with a NA of 0.65 and wavelength of 400 nm com
pared to that of the current rewritable DVD at the same disc tilt. Addition
ally, the effective power density for recording is much smaller than that i
n the case of a DVD with a tilt. In this paper an efficient compensation me
thod for disc tilt will be presented.