High Sierra – multiple drives???

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    Per a prior topic, I re-did my MBP with 2 drives – a 256GB SSD, and a 1TB HDD. I’ve tried to keep a copy of MacOS on the HDD as an alternate startup disk, though I’ve rarely used it.
    I understand High Sierra reconfigures disk structure for SSDs. Questions:
    – Assuming I update from the SSD, I’d expect the SSD to be reconfigured, but not the HDD?? And I’d expect that I can still read the HDD because it’ll still think it’s external?
    – After updating SSD, if I boot from the HHD, will the SSD be readable??

    Bob H.

    Steve Rea
    Steve Rea

    If you upgrade to High Sierra (10.13) it will change the file system from HFS+ to APFS for internal SSDs. No data should be lost, but have a backup just in case.

    If you boot an older OS, it will not see the APFS volume.
    You would need to upgrade your HD to 10.13 as well.

    There are some issues with 3rd party SSDs, and a driver update may be needed before the OS upgrade. Check with the drive manufacturer.

    A Note On High Sierra Compatibility with Third Party SSDs

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