So worst case of 4K 100% random, full span = 5TB
20GB a day normal use x 5 years = 35TB
2.8TB a day/ 35TB = 12.5 days

This is going to be interesting

Is the drive slowing down a lot?

Anvil is that app something you made? Is it going to be the platform for the benchmark tool as well?

@ One_Hertz, does your drive have TRIM?