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There are a few USB3.1 gen2 drives you can buy "ready to use", such as the Samsung t7, or Sandisk Extreme (I think that's the name). (Use BlackMagic Speed Test to check, it's a free download)īTW, is it a 1tb "hard drive" in the 2017 27" iMac, or is it a 1tb "fusion drive"? What kind of reads are you getting from the internal drive NOW? USB3.1 gen2 will give you read speeds of around 850MBps, perhaps a little more. The iMac will boot and run as easily from an external drive as it will from the internal, and will be faster, as well. Then set it up to be an EXTERNAL boot drive.
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Put together a USB3.1 gen2 drive (USBc), and plug it into one of the USBc ports on the back. If you don't want to mess with that, there's "an easier way":
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Yes, it IS "a difficult job" to pry open a 2017 iMac and get it all back together - without breaking anything.
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