Is it possible to add a 2nd hard drive to iMac 27 4k? - Quora
OWC Presents Kit for Adding SSD to 2010 27" Apple iMac - StorageNewsletter
iMac Intel 21.5" and 27" (Late 2009-Mid 2010) SSD Upgrade Bundle - iFixit Store
iFixit Offers Kit To Install 2nd Hard Drive in Mid-2011 iMacs | MacRumors Forums
iMac 2009, iMac 2010 and iMac 2011 - Apple Broadcom BCM94360CD - 802.11 a/b/g/n/ac with Bluetooth 4.0 Upgrade Kit | www.osxwifi.com | Native Support for Apple Broadcom BCM94360CD and BCM943602CDP for PC
iMac Repair & Upgrade, Same Day Services
OWC Double Hard Disk Kit - iMac Repair Kits - SOSav English
iMac Intel 27" (Mid 2010) Dual Hard Drive Kit - iFixit Store
iMac SSD - 4mac
Install SSD iMac 2011 - How-To DIY Guide Tutorial
How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
iMac 2009, iMac 2010 and iMac 2011 - Apple Broadcom BCM94360CD - 802.11 a/b/g/n/ac with Bluetooth 4.0 Upgrade Kit | www.osxwifi.com | Native Support for Apple Broadcom BCM94360CD and BCM943602CDP for PC
OWC Internal SSD DIY Kit for All Apple 27" iMac 2010 Models
OWC DIY Drive Upgrade/Install Kits for Apple iMac Models
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com