A Study of Samples Captured at Phases for Multi-Dimensional Magnetic Recording System with Double Recording Layers

To further increase areal recording density in hard disk drives (HDD), we study a three-dimensional (3D) magnetic recording system with double recording layers and the magnetoresistive (MR) read-sensors. We constructed a read/write channel model that combines an ideal double recording layers with MR reading sensors to evaluate a 3D magnetic recording. In this study, we have evaluated the bit error rate (BER) performance of the generalized partial response (GPR) maximum likelihood (ML) (GPRML) system for the samples captured at the phases of the bit center and boundary under total areal recording density of 8 Tbits/inch2 on a dual recording layers medium (Each areal recording density is 4 Tbit/inch2). As the results, it is certified that the GPRML system for the reproducing waveforms captured at phases of the bit center offers better BER performance compared with that of the bit boundary.