1TB of 8% fill.

#233 at start = 37,696GB
#233 after 1TB 8% fill = 37,824GB
Difference = 128GB

#241 at start = 37,120GB
#241 after 1TB 0fill = 38,144GB
Difference = 1,024GB

@ sergiu, I'll run a 46% fill for 1TB and then I'll do 100% 4K random writes.