Does installing a linux distro clean a disk?

Ah let us have a look to see at which post you highlighted that your D830 was different to the one Cnet tested - and that is because you do not want to look at the facts.
Still at the end of the day it remains a confusing mystery as to how you could install a slick, fast and efficient distro onto a decent Dell and get it to run sooo sloooow…?