It’s all about Pagerank and Pagerank is all about SEO. A website which has a very good SEO, the site will grow faster because its PageRank will be the 1st on google page ranking.
The disk names in Linux are alphabetical. /dev/sda is the first hard drive (the primary master), /dev/sdb is the second etc. The numbers refer to partitions, so /dev/sda1 is the first partition of the first drive.
Linux is a kernel and GNU Linux is the OS and it has hundreds of flavors. GNU/Linux, inspired by UNIX, has become the most widely adopted server operating systems out there.