Weird problem writing 'weak flux' pattern

[admin]

No deliberate randomness is ever required unless the bitcells decoded perfectly for the entire track, and that just doesn't happen because the write splice is almost always a weakbit.  However, it is very easy to determine weakbits in a single revolution and just change the existing weakbit pattern on every rev into a different one if it concerns you.

There are several protections with weakbit and strongbits that do straddle the index, and those work fine under UAE, even with a single revolution.