I have a new 2.13/SSD Air which has been awesome with no lines and fast enough for me to do all my work. Since this is my first Mac (coming from the PC world), I am still getting used to how OSX works. I really like the way OSX installs apps - so simple and transparent compared to Windows. One thing that has been bugging me is whenever I do something like install apps, eject disks or dismount apps, there is "uncoiling spring" like sound coming from the machine. The sound reminds of a hard drive disk head parking when the disk stops spinning. Since I have the SSD, I expect things to be completely silent all the time. Is this an OSX sound or do I have a bad SSD?