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I had two physical drives in a Mac mini, now they are SSD as I upgraded the old HDD.

Could two SSD be merged into one virtual drive? Would it better to make a volume group as I’m in Catalina macOS?

My main drive is a 500GB SSD and has Catalina macOS with two volumes system and data.

I want to add a 120GB SSD into the data APFS volume so that it works transparently.

Perhaps I could mount the second drive with the Data Point mount_apfs /dev/disk1s2 ....

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  • I edited your question to be clearer. What you seem to be asking looks the same as this question APFS container over multiple physical disks to which the answer appears to be probably not. I would install macOS on the small SSD and use the larger for data.
    – lx07
    Commented Dec 8, 2019 at 19:43
  • Good, but how you manage both physical disk, "Data" could be just "Download folder" or "Document folder" but how you can link in the System to be transparent? Maybe with something like the "Firmlinks"?
    – Alfonso Vin
    Commented Dec 8, 2019 at 20:42
  • In Catalina "Macintosh HD - Data" volume is the non read-only volume. A volume doesn't have to be on a separate physical disk. See this Apple page: About the read-only system volume in macOS Catalina
    – lx07
    Commented Dec 8, 2019 at 20:59
  • You likely want RAID 0. I'm not aware of any hardware RAID solutions for the Mac Mini, but it might be worth researching. For software RAID, see here: reddit.com/r/MacOS/comments/74z9mb/apfs_and_software_raid
    – Jivan Pal
    Commented Dec 20, 2019 at 9:40

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