HOW TO: Replace Intel iMac Hard Drive (and why I won't do that) [VIDEO] - LiewCF Tech Blog
Stayin' Alive: Upgrading the CPU, Hard Drive, and RAM on a 2006 iMac
maxupgrades.com: Dual SSD Drives kit for iMac 27 inch 2012 Models with Blade SSD Module with Heatsink and Power and DATA Cables
How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
2011 imac 27" 32GB - final stage of 1TB + 2TB SSD upgrade (replaced HDD & optic drive). Also cleaned out the fans and case. Running 'SSD Fan Control' & 'Macs Fan
320GB Hitachi Hard Drive Upgrade for Mac Pro and iMac
New Apple iMac Has a Meltdown If You Replace or Upgrade the Hard Drive - ExtremeTech