Reply To: High Sierra – multiple drives???

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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