has recently been proposed
as a means of extending relatively conventional heads and
media to much higher areal-densities. TDMR combines two
important techniques: shingled write recording (SWR) and 2-D
(2-D) readback and signal-processing. Either technique can
be used separately to give large gains and the combination of
the two promises particularly large gains. For SWR, a wide
write-pole is used to write a series of overlapping tracks. Of the
initial wide track that is written, only a narrow portion along
one edge of the track remains after the track adjacent to it is
written