原帖由： Dan ,
The Apple blade SSD drive is a custom part. You'll need to replace it with either the Apple OEM unit or a 3rd party unit thats designed for your system. You'll need to take the system completely apart to gain access to the SSD drive. Review this IFIXIT guide: [guide|28992|iMac Intel 21.5" EMC 2544 SSD Replacement]. Opening up the newer 'Thin Series' iMac's are a bear to open! And you risk damaging the display assembly if you are not careful. Make sure you follow the IFIXIT guide to the letter as it doesn't take much to damage the display. Don't forget the additional amount of work it will take to even get to the SSD. You may want to consider just replacing your current HD with a SSD and leave the two SSD drives independent. OWC does offer a 1TB SSD unit that will work in your system. Here is the part: [http://eshop.macsales.com/item/OWC/SSDIM12D960/|Aura 6G Solid State Drive]. So you're half way there. Do take note the SSD is not compatible in slower i5 system.