How do i short stroke a mechanical hard drive?

I was doing research and found something about short stroking a hard drive, i read that your supposed to use hd tune and pay attention to where the blue line drops or something but i never figured out how id configure how much room id take from my hard drive so that i have the most optimal setting. And then i read subtract 15,20 or 25 percent of the space from the volume capacity?

So which way is best when short stroking a mechanical hard drive?

Google can find quite a few good explanations, such as this one.
How to Partition Your Hard Drive to Optimize Performance | PCWorld

But it also finds this cautionary opinion...

So, don't cripple your hard disk drive using the "LBA mod" when you can achieve the same effect by partitioning the drive. If you want faster transfer rates and lower seek times for your operating system and applications, just partition off the outer tracks of your hard disk drive. The first partition of a hard disk drive will always contain the outermost tracks.

Tech ARP -
Modding A Barracuda 7200.11 Into A VelociRaptor Rev. 1.2

So, thank you @smirk24 for asking. In researching this I finally know why so many OEM systems (like my Toshiba) put two partitions on their machines: a C: drive for the OS and a D: drive labelled 'Data' (been puzzling me for years).

I hope i understand this wrong but are you saying that in order to get the safe performance gain id have to make the 2 partitions before the install of windows? Because i tried the 20% and my sequiential reads went from 105 to 115? Lol faster is better so im all ears lol

That makes since thank you. So that means i didn't have to use 20% of my 500gb hard drive though wich is my fault obviously lol.