Re: Huh?
yes you are missing something the author made an assumption the wring way, that there would be less than double the platters, but as about 1/3 of the drive is circuit board and motors and still only requires the same amount of case.
so 2/3 for case and platters, but now delete 2 layers of case, and you are probably looking at close to 2.5 times the number of platters, not the authors less then 2