Your quandary does not speak of the precision required in locating specific disk areas. In the "OLD DAYS", servo tracks were used- read-only, permanent. Holes in the media were also used, but difficult to retrofit. Temperature and voltage will cause inaccuracies. One would need to construct a controller in order to have "bare metal" write-ability. It seems doable. Good fortune, berk

And sad for Irving Fein and Tisha. Berk-

The original reason for me not using Verizon's mail services was that Verizon blacklisted much of Eastern Europe. Now they're on the "freedom train"?