But what about the magnetic properties of SSDs? Any additive alignment for data?

Or the opposite, magnetic aligned fields for all 1’s or all 0’s?

Negligible now, but critically important effects to understand before we build a planet sized drive and wipe it!

Also, a planet sized drive will need to explicitly maintain large reserves of electrons. In theory, enough for an all ones (or zeros) state.

But that could be handled by tiling areas of one’s=high and zero’s=high. With tile charge flipping to maintain a balance in electron needs, locally and globally.