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<blockquote data-quote="pm-r" data-source="post: 1688605" data-attributes="member: 175845">OK, so for the easiest, simplest and reliable method here's what I'd suggest:- make a clone backup using Carbon Copy Cloner (CCC) , or Super Duper, but I'd suggest using CCC onto an external drive or volume partition:<a href="https://bombich.com" target="_blank">https://bombich.com</a>- boot from the clone and make sure it all works.- shutdown your iMac and install the new SSD.- connect and boot from your CCC clone/backup and run Disk Utility to partition and format the new drive as GUID format.- use CCC to clone back your cloned backup.- set your Startup Disk System Preferences to the new SSD volume.- use CCC and setup a backup schedule to a backup drive/volume.That's about as brief as I can make it and what I've done many a time.Some may suggest using a clean install and Migration Assistant, but that's extra work and not always easy, and unusually not necessary, especially with the recent OS X versions.Good luck. And I believe that that OWC SSD has &quot;native&quot; TRIM builtin so you should be able to just carry on, but be careful with the new speed — mistakes can happen VERY fast and probably faster than your eye can catch.&nbsp;&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /></blockquote>

[QUOTE="pm-r, post: 1688605, member: 175845"] OK, so for the easiest, simplest and reliable method here's what I'd suggest: - make a clone backup using Carbon Copy Cloner (CCC) , or Super Duper, but I'd suggest using CCC onto an external drive or volume partition: [url]https://bombich.com[/url] - boot from the clone and make sure it all works. - shutdown your iMac and install the new SSD. - connect and boot from your CCC clone/backup and run Disk Utility to partition and format the new drive as GUID format. - use CCC to clone back your cloned backup. - set your Startup Disk System Preferences to the new SSD volume. - use CCC and setup a backup schedule to a backup drive/volume. That's about as brief as I can make it and what I've done many a time. Some may suggest using a clean install and Migration Assistant, but that's extra work and not always easy, and unusually not necessary, especially with the recent OS X versions. Good luck. And I believe that that OWC SSD has "native" TRIM builtin so you should be able to just carry on, but be careful with the new speed — mistakes can happen VERY fast and probably faster than your eye can catch. ;) [/QUOTE]

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