1. taz323's Avatar
    new update.
    08-13-2020 12:35 AM
  2. Just_Me_D's Avatar
    Thank you, sir. I’m updating my work issues MacBook Air at this very moment. 28 minutes left....
    taz323 likes this.
    08-13-2020 05:42 PM
  3. Ed7789's Avatar
    Could we move this under macOS? Looks to be in the iPhone forum :/
    taz323 likes this.
    08-13-2020 08:51 PM
  4. Janette Ong's Avatar
    Question: Can I install both High Sierra and Catalina on a single (internal) HDD with 2 partitions? I'm confused about the APFS thing, because when I installed the High Sierra, it did not change the drive to APFS and remained HFS+. So does that mean that Catalina cannot co-exist with High Sierra on a separate partition on the same physical drive?

    And if that is the case, which OS should best reside as an external drive? TIA
    08-22-2020 08:24 AM
  5. Trees's Avatar
    The Apple Support article below may help.
    https://support.apple.com/en-us/HT208891

    In the event you may not have seen them, sharing a search term "dual boot mac high sierra and catalina" which brings up articles from other sites.

    I have not tried what you have asked about, nor those from the other sites. Before doing anything, suggest using Time Machine and backing up your Mac to an external drive before experimenting further.
    08-23-2020 08:16 AM

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