To generate a high data transfer rate from a magnetic write head, a faster
flux rise time is needed. This often brings about severe excess
saturation of the head and, as a result, adjacent track erasures often
occur. This problem has been overcome by indenting P1 away from the ABS
so that there is a narrowing of P1 near, but not all the way to, the
write gap. This causes the excess flux associated with high write
currents to be diverted into P2 instead the P1 shoulder.