I have a late '09 iMac 27". My HDD is failing and I've got it replaced under Apple's warranty. However it's once again started to fail the SMART test and it's time I replace it. I would like to replace the internet HDD with an SSD. However I'm unfamiliar as to what is required for the installation. Would I need some sort of 3.5" to 2.5" drive bracket (where do I purchase it)? Also, regarding the temperature sensor, do I need to buy one? I'm planning on purchasing this SSD. Any guidance as to how to do the whole process, will be much appreciated. Thanks.