Recycle disk space NON-STOP to get most of hard drive

Good news: disk space is recyclable.
Deleting files produce more space that can be rewriten with different files.
It means that if you have 400 GB disk and read&write speed of 4 GB/s you can "recycle" all disk space in 100 seconds! If you would have download speed of 1 MB/s you could recycle all disk space every 5 days.

There always seem to be some disk space that is constantly occupied (i.e operational system files)