Downgrading from Big Sur to Catalina

Started 3 months ago | Discussions thread
Nick5 Senior Member • Posts: 1,455
Re: Stuck With Big Sur

kierenlon wrote:

HFS+ is best for hard disks (HDD)

The new APFS is designed to work best on SSD and may even be detrimental on a HDD

Since Mojave your OS Extended (Journaled) internal HDD on iMac 2017, 2019 Fusion Drive has converted to APFS from OS Extended Journaled. Also setting up new Time Machine external HDDLaCie Rugged as OS Extended Journaled and I have seven , will apply APFS automatically with Big Sur. When you set it up it says you applied OS Extended Journaled. Next time open your TM drive under INFO and you shall see APFS.

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