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Well, it looks like there are "issues" with High Sierra and Macs that have Fusion Drives or just hard disk drives:
https://blog.macsales.com/42316-update-macos-high-sierra-and-apfs-compatibility
https://eclecticlight.co/2017/09/15/high-sierra-apfs-not-supported-on-fusion-drives/
That second link contains some details about what the download will look like from the App Store. For my situation, one of my Macs, my mid 2013 13" MacBook Air, has a built-in SSD, and thus can work if it is formatted as AFPS. What I am unclear about is the Samsung 840 Pro 256 gig SSD I installed myself in my late 2012 Mac Mini. I removed the 1 TB Hitachi drive that came with the MIni, and thus I do not have a Fusion Drive setup. Also, what about my two external drives (Samsung 850 Pro 512 gig SSDs)?
In looking more closely at that second link, it looks like I am OK, as it states:
"APFS compatibility
Devices formatted as Mac OS Extended (HFS+) can be read from and written to by devices formatted as APFS.
Translation: You can read and write to disk drives that were formatted as HFS+ from a Mac with a boot drive formatted as APFS.
Devices formatted as APFS can be read from and written to by:
Translation: Drives of any type (USB flash drives, SSDs, HDDs) formatted as APFS can be be read from and written to from a Mac using High Sierra, even if it is not formatted as APFS"
Then of course there is the issue of which third party apps one has, and how they will work with all this to consider.
So, it looks like this initial release of High Sierra is much more complex that prior Mac OS releases. It would thus be the wise move to wait until at least the next ".1" release is available. Of course, one cannot say if that release cures issues. Myself, I still have to wait for 3 critical applications to be updated for High Sierra compatibility (Onyx, Tech Tool Pro, and Logitech Control Center software) before I upgrade. A new version of 1Password was released yesterday, but not specifically for High Sierra compatibility. However, in discussions with AgileBits (the company that makes 1Password), and it is fully compatible with High Sierra.
As I mentioned previously, in discussions with Micromat (the developers of Tech Tool Pro), they are still working on Tech Tool Pro and High Sierra, Have not seen anything yet from Titanium Software (the developers of Onyx), and I have not heard back from Logitech yet regarding their Control Center software (for my Logitech mice) and high Sierra. And i noticed today on the site https://www.macupdate.com/ that Drive Genius, a product similar to Tech Tool Pro, released a newer version of their software which states:
"Version 5.0.5:
https://blog.macsales.com/42316-update-macos-high-sierra-and-apfs-compatibility
https://eclecticlight.co/2017/09/15/high-sierra-apfs-not-supported-on-fusion-drives/
That second link contains some details about what the download will look like from the App Store. For my situation, one of my Macs, my mid 2013 13" MacBook Air, has a built-in SSD, and thus can work if it is formatted as AFPS. What I am unclear about is the Samsung 840 Pro 256 gig SSD I installed myself in my late 2012 Mac Mini. I removed the 1 TB Hitachi drive that came with the MIni, and thus I do not have a Fusion Drive setup. Also, what about my two external drives (Samsung 850 Pro 512 gig SSDs)?
In looking more closely at that second link, it looks like I am OK, as it states:
"APFS compatibility
Devices formatted as Mac OS Extended (HFS+) can be read from and written to by devices formatted as APFS.
Translation: You can read and write to disk drives that were formatted as HFS+ from a Mac with a boot drive formatted as APFS.
Devices formatted as APFS can be read from and written to by:
- Other devices formatted as APFS
- Devices formatted as Mac OS Extended, if using macOS High Sierra
Translation: Drives of any type (USB flash drives, SSDs, HDDs) formatted as APFS can be be read from and written to from a Mac using High Sierra, even if it is not formatted as APFS"
Then of course there is the issue of which third party apps one has, and how they will work with all this to consider.
So, it looks like this initial release of High Sierra is much more complex that prior Mac OS releases. It would thus be the wise move to wait until at least the next ".1" release is available. Of course, one cannot say if that release cures issues. Myself, I still have to wait for 3 critical applications to be updated for High Sierra compatibility (Onyx, Tech Tool Pro, and Logitech Control Center software) before I upgrade. A new version of 1Password was released yesterday, but not specifically for High Sierra compatibility. However, in discussions with AgileBits (the company that makes 1Password), and it is fully compatible with High Sierra.
As I mentioned previously, in discussions with Micromat (the developers of Tech Tool Pro), they are still working on Tech Tool Pro and High Sierra, Have not seen anything yet from Titanium Software (the developers of Onyx), and I have not heard back from Logitech yet regarding their Control Center software (for my Logitech mice) and high Sierra. And i noticed today on the site https://www.macupdate.com/ that Drive Genius, a product similar to Tech Tool Pro, released a newer version of their software which states:
"Version 5.0.5:
- Due to major changes in macOS 10.13, all current versions of Drive Genius are incompatible with the upcoming release. We are working hard on a new version to fully support 10.13, but in the meantime we are releasing 5.0.5 to disable Drive Genius on 10.13."