If your laptop starts making any of these sounds you are probably about to have a bad day.  What happens when your servers start making these sounds?  Pulling a server our of rotation for a hard drive failure and then having to ghost, jumpstart, or kickstart it again is a waste of time and resources.  

Depending on your application it might make sense to consider ordering your next set of app servers with solid state drives (SSD) instead of hard disk drives (HDD). When the disk storage is used primarily for the operating system, web/app server, and code these configurations start to make sense. The higher price might very well be offset with the faster speed and lower heat as well as  less energy consumption and greater mean time between failures.