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<blockquote data-quote="pigoo3" data-source="post: 1915474" data-attributes="member: 56379">Definitely understand your desire to have 2 macOS's available to you (El Capitan for older apps &amp; High Sierra as something newer).One thing to consider...what percent of the time would you use the El Capitan OS...and what percent of the time would you use High Sierra?&nbsp; Since partitioning the iMac's internal Fusion drive has its downsides/complications...you could install the macOS on the internal drive that you would be using the most...and install the macOS you would use less on some sort of external drive.If you did the external 512GB blade SSD via UBS 3.0 idea I mentioned previously (about $75-$85)...you could try this out and see if its speed is good enough for the percent of time you would need the macOS installed on it (El Capitan or High Sierra).&nbsp; If you find it's still too slow for you...return the items you purchased (of course purchase from a site that allows easy returns...such as Amazon).Good luck,<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Nick</blockquote>

[QUOTE="pigoo3, post: 1915474, member: 56379"] Definitely understand your desire to have 2 macOS's available to you (El Capitan for older apps & High Sierra as something newer). One thing to consider...what percent of the time would you use the El Capitan OS...and what percent of the time would you use High Sierra? Since partitioning the iMac's internal Fusion drive has its downsides/complications...you could install the macOS on the internal drive that you would be using the most...and install the macOS you would use less on some sort of external drive. If you did the external 512GB blade SSD via UBS 3.0 idea I mentioned previously (about $75-$85)...you could try this out and see if its speed is good enough for the percent of time you would need the macOS installed on it (El Capitan or High Sierra). If you find it's still too slow for you...return the items you purchased (of course purchase from a site that allows easy returns...such as Amazon). Good luck,:) Nick [/QUOTE]

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