I've thinking to upgrade my iMac late 2009 with an SSD. Its has a SATA II port and now uses a HD Hitachi 7200rpm. In your opinions, if I'll upgrade, I can see an increase of performance or not? In my project i've thinking to put SSD (250GB) in HD slot and buy an external case for HD in order to store photos and other big files.
Surfing online I've found some forums talk about temperature sensor on HD. I didn't understand which problem there are with this component. Can you explain me if there are problems?