thanks for the resources, I'll definitely need them

but yeah, I'm trying to go full solid state with no moving parts
the problem with old-style weaved core-memory is you can't write to one core without affecting others, making it super slow with all sorts of validation
so yeah, I'm trying to achieve MRAM style isolation with addressable bits
the problem is the average consumer can't go out and buy an MRAM SSD, let alone afford one.
(the benefits of MRAM over NAND is no write limit (endurance), and no validation (speed))
and capitalism doesn't want non-disposable drives.
so yeah, I'm trying to work on my own solution
I'll worry about the encoder once I have a decent array built
all that really needs to be done is to rewrite a 1 after reading it
(and even then I can probably just use a transistor on the read output coil to the write coil to achieve that)
getting back to topic though
so basically I'd suggested something previously that would work??
basically this with a microscopic film core instead of an iron core:

EDIT:
btw I'm not too worried about self-inductance (heat) cause I don't know of a drive that writes to the same bit more than 10 times a second
in fact afaik the file being written to is shuffled about on the drive, so usually you'd change the state of a single bit up to 3 times a day on average use.

(this doesn't factor in swap(file) or pagefile use)
the only time it becomes an issue is if it smokes after a single use.
EDIT2:
I'm gonna assume from the no response that my question is what you've been talking about all along.

initially I was actually thinking of the OP image as something like this:

where the inductance would carry from the primary to the secondary coil
but I see now that's not the case, and it would basically burst into magic smoke before the secondary coil would pick anything up
so answering my own question here, yeah, the previous image is what I'd want to go for in order for the secondary coil to pick up the state change of the film.
now all I need, if someone would please, is to test how many turns I would need for this to be effective at a microscopic level

cause I don't have any tools, and would have to build a specialized probe from salvaged components for sensitive measuring that I could plug into my PC soundcard
I'm sure you can understand why I would rather someone else test for me XD