Holographic data storage (HDS) is a prospective, next-generation mass optical storage system. In HDS,
wave-front aberration in the optical system causes deterioration of the reconstructed signal quality. In this study, to clarify the
margin allowed for HDS drive development, the influence of aberration in the case of wave-front aberration of defocus, where
the influence of image degradation is especially high, was measured in the optical system. Further, with the aim to improve the
error rate, a finite impulse response (FIR) filter using LMMSE was applied to the image deteriorated by the wave-front
aberration. Consequently, we confirmed that the error rate can be reduced by applying the FIR filter for each modulation code.