Sierra, High Sierra and Mojave parititions

[mattspace]

trying to think ahead for potential issues before setting up test partitions on a sierra system with a non-efi GPU.

• If sierra is on my SSD, will the High Sierra or Mojave installers attempt to convert it to APFS, when trying to install them on partitions on a different (spinner) disk? Or is it only the install target they attempt to convert?
• Will my Sierra system be able to recognise the APFS partitions as bootable options in the startup disk prefpane, or will I need to boot with option to switch to one of them?
  • If so, how does that mix with no boot screens on RX580?

thanks.

*grr* stupid subject typo.

 

[h9826790]

trying to think ahead for potential issues before setting up test partitions on a sierra system with a non-efi GPU.

• If sierra is on my SSD, will the High Sierra or Mojave installers attempt to convert it to APFS, when trying to install them on partitions on a different (spinner) disk? Or is it only the install target they attempt to convert?
• Will my Sierra system be able to recognise the APFS partitions as bootable options in the startup disk prefpane, or will I need to boot with option to switch to one of them?
  • If so, how does that mix with no boot screens on RX580?

thanks.

*grr* stupid subject typo.

My experience so far.

1) Only the target disk will be converted to APFS.

2) 10.12.6 can read APFS.

 

[Spacedust]

I'm running both High Sierra and Mojave on HFS+, but when Mojave is on HFS+ it won't upgrade

Why there is no APFS support under Windows?

 

[mattspace]

My experience so far.

1) Only the target disk will be converted to APFS.

2) 10.12.6 can read APFS.

and my bluetooth is gone on High Sierra *sigh* full continuity etc on Sierra, to "no information available" on HS :/