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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Replaced Harddrive with SSD and drive not being recognized

I replaced the hard drive with a SSD on my imac, 27”.  I copied the old hard drive before I started.  Replaced drive with SSD from ifixit upon reboot it is not recognizing it, tried to do a time machine recovery but new drive not recognized to write to.

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You need to format the drive GUID Mac Extended Journaled before you start or your Mac will not see it internally. Use Disk Utilities to do this.

I would format the drive first, then install the system. Now use Migration Assistant to move your data. This way the Repair Partition gets installed.

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Similar problem but when I run Disk Utility it only recognizes the external backup drive and NOT the new SSD.

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@irvsnyder Please start a new question on this as the advent of Mojave and Catalina and the new APSF formatting has introduced new problems when install and recognizing non-APSF formatted external drives.

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gretchen will be eternally grateful.
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