One does not just split up a hard drive. Even back in the early 90s these were assembled in a clean-room. Cracking open the case pretty much destroys the contents because ambient dust, pollen, fingerprints, etc. contaminate the platters and will result in a hard-crash once the platters are spun up to speed.
One doesn't just put the drive back together expecting it to be readable, either. Having the whole drive and being able to read its contents after reassembly are two vastly different things.
I think what they were talking about is dividing what was on the hard drive onto a floppy or another hard drive for safe keeping...
You know as well as I do, you don’t ‘break’ a hard drive in two and then glue it together again....