Investigation of Offtrack Read Capability in Hard Disk Drive With Two-Dimensional Magnetic Recording (TDMR)

Abstract

This article investigates the offtrack read capability (OTRC) in hard disk drives utilizing Two-Dimensional magnetic recording (TDMR) technology. The offtrack bit error rate (BER) bathtub was measured in the 747 test, conducted over a range of linear densities. A Gaussian model is proposed to fit the dual BER peaks observed in the OTRC bathtub of the TDMR head due to the cross-track separation (CTS). Using the Gaussian model, we can fit the OTRC bathtub with dual BER peaks, so as to enhance the measurement of OTRC and squeeze-to-death (S2D) in hard disk drives with TDMR technology.