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Discussion Starter · #1 ·
From what I’ve read, High Sierra (10.13) converts a Mac with SSD to APFS. What happens when I use external storage like hard drives and USB keys. Will 10.13 read and write to these devices without altering the file structure, or will they be converted to APFS and rendered unreadable to Mac OS 10.12 or less?
 

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Rest assured, APFS will not affect external drives, network drives, internal rotational drives and Fusion drives- yet.

APFS seems to be in a kind of beta state- even if it has already been released.

One more step towards the fusion between Mac OS and iOS, I'm afraid
 

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Well High Sierra/APFS bricked my external HD after upgrade!
Investigating possible fixes and will report back...
 

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This is fascinating.
Did you upgrade to High Sierra with your external HDD switched on?

Did you lose any data? If so, try the latest version of Data Rescue or Disk Drill.

Good luck!
 

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Discussion Starter · #7 ·
Well High Sierra/APFS bricked my external HD after upgrade!
Investigating possible fixes and will report back...
Scary stuff! This is a nightmare result. I hope you recover everything. Let us know what you learn.
 

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This is fascinating.
Did you upgrade to High Sierra with your external HDD switched on?

Did you lose any data? If so, try the latest version of Data Rescue or Disk Drill.

Good luck!
Every once in awhile OS updates create havoc, 10.3.7 and 10.4.1 come to mind. Best policy has long been to disable all secondary drives when installing a new OS or an OS update and with a change in formatting involved, High Sierra could be particularly dangerous.

Not a personal concern at the moment, but if you drag and drop a file from an APFS drive to back it up to an HFS+ device will the copied version be usable?
 

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eMacMan;2573897 Not a personal concern at the moment said:
Formatting schemes do not affect your files. E.g.: ever had any problems with files copied onto, say, Fat32 or Exfat thumb drives?

NTFS is a different matter, because normally, MacOS(X) cannot write to that.
 

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I read the conversation in the Apple forum — still no resolution for you!
As you’ve sought a solution, have you read anything about how to avoid this problem when installing High Sierra?
Well I'm now pretty sure that the first drive is bricked. As it was an Amazon purchase less than 6 weeks old, they kindly sent a replacement. The second drive did pretty much the same thing but has now appeared in the devices window and I was able to reformat it. It now seems to behave correctly.

Sync.com is now playing up to restore the data but their tech support is on it...

My recommendation is to be very careful with HDDs and High Sierra and perhaps to have 'double redundancy' before upgrading. Otherwise the OS works well.
 

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Perhaps someone could enlighten me. Do files that are created in OS 10.12 and below have a HFS+ file structure and somehow this is not compatible with APFS of OS 10.13, and this could end up bricking an external HDD?

I thought I had read somewhere that OS 10.13 would only implement APFS on SSD. If the internal drive of a Mac is HDD, OS 10.13 will continue to use HFS+ .
 

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Discussion Starter · #15 ·
Perhaps someone could enlighten me. Do files that are created in OS 10.12 and below have a HFS+ file structure and somehow this is not compatible with APFS of OS 10.13, and this could end up bricking an external HDD?

I thought I had read somewhere that OS 10.13 would only implement APFS on SSD. If the internal drive of a Mac is HDD, OS 10.13 will continue to use HFS+ .
My understanding was the same: OS 10.13 would only implement APFS on SSD. But my peripheral devices are all HFS+ and I was concerned about their integrity when accessed (reading and writing) by a computer with AFPS. I’m not convinced yet that there would be no problem (see Moscool above).

Perhaps the problems arise only when external drives are mounted by Mac OS when 10.13 is being installed.
 

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Discussion Starter · #16 ·
Has the latest High Sierra update addressed the issue of bricking external HDs? I’ve done some research but it doesn’t come up as a topic.
 

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i am not surprised by reading through this thread. 10.13 has bricked many many computers of my clients.
failed updates only to end up reformating and starting over from your last time machine and back to 10.12 - where it works.
 

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i am not surprised by reading through this thread. 10.13 has bricked many many computers of my clients.

That does NOT sound like an encouraging comment!!!

With your experience in these cases, would you say the problem is/was due to the macOS High Sierra 10.13.x Install or to the complication of the APFS formatting?

Or are there some operator/user problems as well and/or a goofy running Mac even before the HS install???

Most Mac users I know and who can update, I am NOT going to say "upgrade!!!, are avoiding installing macOS High Sierra 10.13.x, at least so far.
I do not really consider the last small update a proper macOS X update.


- Patrick
======
 

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the issue is the update begins and then stops.. and the computer is in either two states.
1. spinning wheel during boot
or 2. log in screen but then spinning wheel when you want to get in to your user

the worst part of this is - all the folders have don't enter symbols on them when you target disk mode it to recover.

i have been saying to many many users - do not update what so ever.. there is no 'benefit' to it.
unless you are willing to do it from scratch and spend hundreds of dollars on software upgrades
and yes 50% chance your externals will not mount.
 
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