More Mojave APFS Questions

[getrealbro]

What does the Mojave installer do with/to an internal spinning hard disk (GUID partition map & HFS+) that has 2 partitions: System and Data?

Does the installer convert the whole drive to APFS?

And if so, does it maintain the “partitioning”?

GetRealBro

 

[Weaselboy]

Does the installer convert the whole drive to APFS?

It will only convert the partition the OS is on.

 

[getrealbro]

It will only convert the partition the OS is on.

Thanks! If I understand you correctly, after installing Mojave the internal hard drive would retain the GUID partitions. The System partition would be formatted APFS and the Data partition would remain formatted HFS+. So this would allow me to boot using an older version of OS X on an external drive, SD card, etc. to run legacy software accessing files in the HFS+ formatted Data partition.

Thanks again — GetRealBro

 

[Weaselboy]

Thanks! If I understand you correctly, after installing Mojave the internal hard drive would retain the GUID partitions. The System partition would be formatted APFS and the Data partition would remain formatted HFS+. So this would allow me to boot using an older version of OS X on an external drive, SD card, etc. to run legacy software accessing files in the HFS+ formatted Data partition.

Thanks again — GetRealBro

Yep... exactly.