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Apple Computing Products:
macOS - Operating System
Operating with TWO OS systems
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<blockquote data-quote="pigoo3" data-source="post: 1824063" data-attributes="member: 56379"><p>If this question was asked as little as 1 year ago (or less)...I would have said a definite yes. I happen to have a hard drive with 5 partitions...with a different macOS version installed on each partition.</p><p></p><p>What has changed within the last year or less you may ask??...Apple's newest storage device format called APFS. Before this..."Mac OS Extended (Journaled)" was pretty much the default storage device format most MacUsers used (from 1998 until now)...21 years!!!</p><p></p><p>APFS has it's advantages...but one downside to APFS is backward compatibility. Storage devices running macOS version's older than macOS Sierra (10.12) cannot read or write to an APFS formatted drive. Thus an older macOS (like El Capitan, 10.11) cannot read/write to an APFS formatted drive.</p><p></p><p>Thus the answer is...officially according to Apple...a hard drive split into two partitions cannot run both El Capitan & Mojave (since this hard drive would be formatted with APFS...which El Captain can't work with). </p><p></p><p>But unofficially...I have seen that there is some sort of "Mojave Patcher" out there that somehow allows Mojave to be installed on storage devices formatted as Mac OS Extended (Journaled)...and there can be some performance issues with this patcher setup.</p><p></p><p>HTH,</p><p></p><p>- Nick</p></blockquote><p></p>
[QUOTE="pigoo3, post: 1824063, member: 56379"] If this question was asked as little as 1 year ago (or less)...I would have said a definite yes. I happen to have a hard drive with 5 partitions...with a different macOS version installed on each partition. What has changed within the last year or less you may ask??...Apple's newest storage device format called APFS. Before this..."Mac OS Extended (Journaled)" was pretty much the default storage device format most MacUsers used (from 1998 until now)...21 years!!! APFS has it's advantages...but one downside to APFS is backward compatibility. Storage devices running macOS version's older than macOS Sierra (10.12) cannot read or write to an APFS formatted drive. Thus an older macOS (like El Capitan, 10.11) cannot read/write to an APFS formatted drive. Thus the answer is...officially according to Apple...a hard drive split into two partitions cannot run both El Capitan & Mojave (since this hard drive would be formatted with APFS...which El Captain can't work with). But unofficially...I have seen that there is some sort of "Mojave Patcher" out there that somehow allows Mojave to be installed on storage devices formatted as Mac OS Extended (Journaled)...and there can be some performance issues with this patcher setup. HTH, - Nick [/QUOTE]
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Apple Computing Products:
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Operating with TWO OS systems
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