Disk-noise induced peak jitters in high density recording

Peak jitters due to various sources of disk noise are estimated, and it is shown that for the present experimental environment, transition noise is most important, followed by similar contributions from both background and edge noise. As the trackwidth is reduced, the resultant disk noise exhibits a gradual 1/√RW behavior if edge noise is not present, but a much more rapid 1/RW behavior if edge noise is present. These findings highlight the importance of eliminating edge noise in narrow track recording with write-wide read-narrow configurations. Results show that due to the early onset of edge noise contributions towards the track edges, a sizeable read-write margin might be needed to avoid noise contributions in narrow track recording