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I have purchased a 128GB SSD Question

  1. If I was to keep the original drive installed and install the ssd alongside what cable(s) would I need?
  2. If I was to go with what I was thinking of doing and replacing the original drive for my SSD can I use the already existing cable(s)?

Here’s the IFIXIT guide you’ll need to follow: Installing iMac Intel 27" EMC 2429 Dual Drive Kit (HDD or SSD) and here is the parts you’ll need: iMac Intel 27" (Mid 2011) Dual Hard Drive Kit If you are thinking of swapping out your HDD for the SSD you’ll have tow issues first the HDD is 3.5" Vs your SSD which is 2.5" so you’ll need an adapter frame to hold the SSD. In addition your system uses a built-in thermal sensor within the HDD which the SSD does not have. Without replacing the sensor your systems cooling system will go wild! You’ll need this external in-line sensor from OWC: In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade Frankly, while a bit more work the dual drive config offer more benefits! Here you can alter the boot from the HDD to the SSD so you get quicker boot ups and yet you have the deeper storage of the HDD.