Everybody knew exactly what kilo mega and giga ment. when drive vendors deliberatly lied on there pdf’s about their drive sizes. Warnings were issued: this drive will not work in a raid as a replacement for same size!!. And everybody was throwing fumes on mailinglists about the bullshit situation.
But money won, as usual.
Source: threw fumes!
What is wrong with your system that requires disabeling updates?
Been running debian stable on a few hundred servers for 25 ish years.
And I always install and enable unattended upgrades. And it have never been a problem. Not even once.