I really like my iMac 27" medio 2011, but one of the thinks I regret, is that I did not order it with a SSD drive. It is bought with a 1TB SATA Disk. From the first day, I noticed that the HDD had a must more audible noise compared with my MacBook Pro. I've almost never hear the HDD in my MBP, but the HDD in my iMac is audible when I'm e.g. opening apps, startup etc. Generally I've learned to ignore this noise, but I still think, that this Mac sometimes can take long time to open apps, startup etc. Are there any method to check the HDD in my Mac? To check if it is performing well. I've peraired disk permissins etc. in the Disk Utility.