I remember a time when setting aside 10–20% of your SSD felt less like a suggestion and was more of a survival tactic. It’s the one piece of advice I gave everyone in school and in college, ending with an “if you know, you know” shrug. This was a suggestion I followed after reading about it buried deep in forums, and it was passed around like sacred knowledge among early SSD adopters trying to make an expensive and fragile storage option a little more reliable.