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Because APFS is slllloooowowwwwwww on HDDs. On a 6xHDD promise thunderbolt array, it’s brutally crippling over time.

One reason is APFS is designed for SSDs and assumes each disk block has an equal latency to read it.



I think Apple hasn't sold anything with an HDD for 5+ years though?


Billions of externals HDD exist, continue to be sold, and are the best price/performance/durability for external backup drives though?


As another poster already noted, external HDDs may be needed, especially because Apple computers have only puny (or greatly overpriced) SSDs.


Usually both at the same time. Soldered on the board and unchangeable.


External HDDs.




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