It means on this page for the drive size, don't put the full amount.
So in the example below it is a 2TB drive (2,000GB).
You don't put 2000GB there as the drive needs some "free" space for when it is full and is overwriting and saving at the same time.
So 90% of 2000GB would mean do not put more than 1,800GB in that location, and in this example, the person allocated a little extra free space and put 1,750GB
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Outstanding! Thank you.
I have met very few Technical people in my life that provide such clear, understandable answers as you have been providing. Most of the time tech folks are personally so familiar with their systems that they communicate in "tech speak". They will provide an accurate answer like: Seven, but they forget that the lay person doesn't know how to get to that specific part. Tech folk needed to say, "Go to One, then scroll down and see menu option X and then select Seven" Or for us command line folks, the correct qualifiers.
Can't tell you how much I appreciate you and how much it has improved my system!