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TurboCAD Mac | macOS High Sierra 10.13.1
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* March 10, 2018, 10:46:28 PM
#15
Quote
simply because Apple made me "upgrade" my OS.

I'm not upgrading yet due to the change in the file system that Apple will force on my MBP.

Versions before V10 will not be fixed for High Sierra. IMSI does have upgrade discounts and if you subscribe to their newsletter there are sales from time to time. Check the website or contact sales support. See the first post in this thread.

Enjoy
Mitch

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* April 12, 2018, 04:27:51 PM
#16
On the topic of High Sierra:

APFS is optimized with solid state storage in mind. Think every device Apple makes other than the mainstream computing platform.

I don't see HFS Plus going away anytime soon. A spinning disc does not benefit from, and will actually suffer performance degradation over time with APFS. 

That said. it only converts the file system to APFS if the install target volume is on Solid State / Flash storage. (SSD/SD/TF/CF card, etc)

You can opt out too:

The key to that is to pass the option flag '--converttoapfs NO' to the installer when starting it up.

Open up a terminal session:

If you've got the "Install macOS High Sierra.app" in /Applications

Code: [Select]
/Applications/"Install macOS High Sierra.app"/Contents/Resources/startosinstall --converttoapfs NO --agreetolicenseor
Code: [Select]
/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --converttoapfs NO --agreetolicense
..and paste that in at the prompt.

If you've got the Installer application somewhere else, have made a boot-able disc/flash/whatever out of it, then you can launch that one the same way:

Code: [Select]
mac # cd /Path/to/Installer

mac # /Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --converttoapfs NO --agreetolicense

...answer the rest of the prompts accordingly.



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* April 12, 2018, 05:45:01 PM
#17
Quote
That said. it only converts the file system to APFS if the install target volume is on Solid State / Flash storage. (SSD/SD/TF/CF card, etc)

You can opt out too:

My MBP is SSD plus I use Time Machine for backup. The new file system is not optional for an SSD and it is not compatible with Time Machine unless my information is wrong/out of date. I am unsure of compatibility with USB and other removable drives. Until these issues are addressed I will not able to upgrade.

Enjoy
Mitch

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* April 12, 2018, 11:09:27 PM
#18
The new file system is not optional for an SSD and it is not compatible with Time Machine unless my information is wrong/out of date.

If the install is invoked manually using the terminal method it will -NOT- touch the file system. I have plenty of high Sierra installs on SSDs formatted GUID Partition Table / HFS Extended format.

It does not ever do anything to any other volumes on the system. Ever.

As for Time Machine, the only issue there is that the Time Machine where the backups are placed can not be APFS.  An APFS volume can absolutely be backed up/restored with Time Machine, The root cause being that APFS does not support Hard Links and that is how Time Machine organizes access to unique entries.

Hard Links are a method of "aliasing" where there is more than one entry pointing to the same data in a file system. If you have Hard Link entries, the data occupied by the file will -NOT- be recovered as long as any other Hard Links to that same data are present. Where as with a Finder Alias, (Symbolic Link) you can delete the actual file and have any aliases remain as broken links.

The method that the disk is mounted is not relevant to APFS optimal performance. (USB, SATA, Firewire etc..)  Rather it is the medium. Flash/SSD volumes that are used strictly with Apple devices will benefit from APFS. Otherwise leave it alone.

Again, the -ONLY- time when file system conversion is even an issue is during an INITIAL install/upgrade, and will only happen if the volume is electronic based, unless the install was started with --convertoapfs NO enabled.

Likewise, the opposite is also true. You could force APFS on a volume during a High Sierra install/in place upgrade by specifying --converttoapfs YES .

That is the only time ever. Any Software Updates, e.g. 10.13.x to 10.13.x will NEVER change a file system.

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