Been looking on the Internet, and anything intelligible can not find.
I bought the hard drive to 1.5 TB, formatnul it to ext4, and ext4 with the default settings ate 26(!)GB. I know about the reservation of 5% of the space I have turned it off. It was found experimentally that created a huge number inode. Formatted with the -N 1000000.
1) whether Correctly I made?
2) Why is default such a large overhead?