A modified PRML channel for perpendicular magnetic recording

Abstract

PRML channels for perpendicular magnetic recording with a ring head and a single layer magnetic media are investigated. The general expression of these PRML channels with dipulse-shaped signals is defined, and one PRML channel suitable for high-speed processing with a compact circuit is found. Simulations confirm that these PRML channels have better performance than for longitudinal magnetic recording.

Evaluation of read channel performance for perpendicular patterned media

“…The PR targets that have been investigated are PRML channels for perpendicular magnetic recording proposed by Ide [7] with PR polynomial y ¼ ð1 þ DÞ P ðD Q À 1Þð1 À DÞ:…”

New data detection method for a HDD with patterned media

“…In perpendicular recording, the (1-D) term can be removed [7]. For perpendicular patterned media, generalized PR target [8] or PR2 [3] can be used. Since PRML equalization changes the shape of the isolated pulse, if we take the ideal equalized isolated pulse of PR channels, we can estimate the channel density of Eq.(2).…”

Strategy for Implementation of Perpendicular Magnetic Recording

“…The most primitive way for single layer perpendicular recording media is to transform the dipulse waveforms to single pulses using phase compensation [36], and then process them in the same manner as for longitudinal recording. The most sophisticated way is to retrieve the dipulse directly, which was proposed by Ide based on a PR5 channel [37]. A simple signal processing for signals from composite media was proposed by O. J.…”