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It took quite a while for anybody to notice, and the one who did was a filesystems specialist running tests. That's not to say that nobody was affected, but it puts things in to perspective a bit.

I think most people here have no idea what a filesystem is or does, or how complex it is. For comparison, Microsoft have been trying to replace their filesystem for the last 6 years (https://en.wikipedia.org/wiki/ReFS). Read the wiki page, google a bit - you'll quickly find that it has a host of holes and is still not bootable. Apple deserve commendations for how quickly and smoothly their filesystem transition has been, despite this bug.
It's not comparable, Microsoft have been trying, and failing, to push out ReFS for six years and fall back to the safe default which is is NTFS. Apple is forcing users to go to Apple File System whether they like it or not.
 
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Mike is the man! Nice catch. Big time CCC user here and fully believe there is no better way to back up and restore quickly and accurately.

Yeah Mike is good and lots of people swear by CCC, but I still prefer Superduper! and think it's safer
 
Wow, this makes me wonder. Did Apple and APFS destroy my only 2 year old Seagate drive with mostly disk images on it?

You converted all the disk images to sparse APFS, then what? Very curious what would trash the drive.

APFS is only for SSD, remember.
 
Color me another one of those absolutely not 'upgrading' to High Sierra until I absolutely have to. I make my living using Macs. An unexpected loss of data like this one that could propagate to my multiple backups could wipe out my livelihood.

I'll note again that Apple's MacOS quality has declined. It has to be a management issue. It can't be a resource issue - the company has nearly one-quarter trillion dollars in cash or cash equivalents. The annual investment yield of just 5% of that resource would support literally thousands of QA engineers - as a tax-deductible expense - forever. WTF, Apple?
 
You converted all the disk images to sparse APFS, then what? Very curious what would trash the drive.

APFS is only for SSD, remember.

APFS is said to be optimised for SSD, but it's not exclusive to SSD
 
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I wonder if this is related to high sierra suddenly invalidating my time machine backups to my NAS, and demanding to do a new full. (Loosing two years worth of history). Then doing it again 2 weeks later.
I've been dealing with this same issue, however, I'm still using Sierra, not HS. Began right after Sierra update.
 
I wonder if this is related to high sierra suddenly invalidating my time machine backups to my NAS, and demanding to do a new full. (Loosing two years worth of history). Then doing it again 2 weeks later.

Unlikely. I’ve been using two NAS for time machine backups for years, long before high Sierra, and have had this issue on and off for that while time. It hasn’t happened to me for about 6 months, though. It seems updates to synology’s operating system and macOS have stabilized the issue for me.

Also, it is unlikely that you are using APFS images for time machine targets on your NAS. More likely these are still HFS+.
 
Glad I reverted to Sierra when I deemed High Sierra a S-show after a couple of weeks. There seems to be no end to Apple's incompetence with this OS.
Generally everything goes wrong with me, and I haven't had any issues with High Sierra, even on my old Mac Pro. But if I did video work or something where I don't just have easy cloud backups of everything, I'd stay the heck away from AFPS for a while so people can work out bugs like this.

P.S. My work-only laptop is on a very conservative upgrade cycle of staying on the oldest OS that has both Xcode support and security updates. And security updates seem to go back to El Capitan.
 
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Color me another one of those absolutely not 'upgrading' to High Sierra until I absolutely have to. I make my living using Macs. An unexpected loss of data like this one that could propagate to my multiple backups could wipe out my livelihood.

I'll note again that Apple's MacOS quality has declined. It has to be a management issue. It can't be a resource issue - the company has nearly one-quarter trillion dollars in cash or cash equivalents. The annual investment yield of just 5% of that resource would support literally thousands of QA engineers - as a tax-deductible expense - forever. WTF, Apple?

I’ve been using OS X/macOS since version 10.0.0 and there sure has been problems in many of the major versions previously too.

OS X 10.2 (the first usable version, speed wise?) had an issue that caused the loginwindow process to crash in certain scenarios which immideately throwed you back to the login screen causing all your non-saved work to be lost. Wasn’t fixed until OS X 10.3.

OS X 10.4 had an issue when browsing network shares that could cause a kernel panic. Wasn’t fixed until OS X 10.5.

OS X 10.5 got a bug in one of its updates (I think 10.5.2 or so) which corrupted a photoshop file (not sure if it also affected other file types, but I think so) the second time you attempted to save it on a network share. Was fixed in the next dot update this time, but still.

Just a few examples I remember from the top of my head.

High Sierra is in fact very stable and quite fast for me, overall.
 
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<-- will be stickin' with HFS+ for a long time to come...

Same here. Until 2020 at least or maybe I'll wait until macOS 10.20.
Funny (...or not), just yesterday I got several freezes and my Mac mini with High Sierra wouldn't boot any more. Going into recovery and Disk Utility gave the message "error: apfs_extentref: btn: invaldid o_oid (0x0)". Nothing to be done I understood. Pulling out the SSD and connecting it to a HFS+ Mac was no use since it can't read APFS.

So I had to use the Terminal to back up important stuff to an external drive. Reinstalling Lion which was booed out when it came actually seems quite fast and stable in comparision. Will have to update to Mavericks for software compatibility though, maybe El Capitan for Hardware compatibility. Would maybe install Sierra but never again High Sierra due to the file system.
 
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oh boy..another embarrassing bug in a operating system that used to be solid and extremely reliable..(years ago)..
I hate High Sierra and also Sierra..both slowed down my 2016 retina MacBook and I just regret updating to this awful version.
It's been a while..I'm looking into downgrading and will NEVER upgrade OSX again.
bugs aside,I have no doubt Apple is deliberately slowing down Macs too, just like the embarrassing leak about iPhones..they do it with Macs too.
 
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hynix has memory leak problems and its not a very good memory when you buy a mac with 2000$ you expect better memories like micron or samsung
thats being said some rare macbook pros have micron memory...
You DO realize, of course, that a "Memory Leak" is a SOFTWARE issue, NOT a hardware one, right?
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dude sorry but its wrong memory leak might be software related but if you use cheap memories it might cause slowing down if you have good memories you wouldnt notice performance loss but on the cheap memory it might cause system freezing or other issues some newer memory modules have features to prevent performance loss -expensive server grade memories have stability features like ECC- i was experiencing memory leaks with hynix and macbook was freezing... with micron memories there is quite less leaks either that or they dont cause performance loss & freezings like on the hynix...
You had a bad "stick" of Hynix RAM. Nothing more, nothing less.
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I'm using them, but with HFS+. Didn't trust APFS considering Apple's track record and I was right. APFS needs at least two more years before considering safe.

I agree not many people will hit this error. I just wonder if they even tried unit testing.
Only on EVERY iOS device for TWO major revisions.

You think that's enough "units" for you?
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Apple doesn't really fix most bugs because they just release a "new" version and the sheeple move on...Lion comes to mind for me.
And you think Microsoft and the Linux Distros don't do the same thing? EVERY OS has bugs that seem to go on and on. This one is reportedly already fixed.
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right...thats why server grade expensive memories have hardware features like ECC, to protect performance & data loss...
Oh, GOD no!

Sigh...

No HARDWARE that isn't running on the Starship Enterprise can detect/prevent/repair it when SOFTWARE doesn't know how to properly use malloc or whatever it is called in a particular computer language. Releasing unused blocks of memory (or rather, forgetting-to) is what causes a "Memory Leak", which is the gradual decline in FREE MEMORY as time goes on, sometimes because a process/thread crashes, and the OS doesn't reclaim the memory, and sometimes, like with certain versions of Safari, because the Application doesn't "flag" unused blocks of memory as being "purge-able", like when you close a browser Tab.
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Apple should have stuck with ZFS years ago. I'll stay on El Capitain for a number of years because it works on most modern and previous Apple hardware.
You can thank Oracle for all that.
 
I wonder if this is related to high sierra suddenly invalidating my time machine backups to my NAS, and demanding to do a new full. (Loosing two years worth of history). Then doing it again 2 weeks later.

This is an old problem with time machine. The verification often fails and after n failures time machine requires to make a new backup. Not only is the history lost. While the new backup is created, there is no backup at all.

BTW. During verification I loose WiFi every couple of minutes. I have to disable Wifi an reable it again to keep on working.
 
imo its hardware not software apple have been using cheap memories since tim cook
The user is suspended, but to anyone wondering, memory leaks are software bugs that have nothing to do with faulty memory.
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So does this affect time machine backups?
Geez. If so, all TM backups are hosed. Good thing I almost never update my server.
 
I still wonder why they dropped that, maybe it didn't scale down for iOS or something
Ask Oracle. They ruined it for Apple by dicking-around with the licensing.

After Oracle bought Sun and as a bonus, inherited ZFS, Apple got worried that Oracle could take ZFS completely private at any time, and so they decided not to bet the farm on it for the next 20 years or so...
 
im not arguing with you anymore enjoy your cheap memory in your mac and memory leaks while im having great peformance on micron memory without any memory leaks oh btw im talking a real experience here after replacing default memory with micron memory there is way less memory leaks ui lags and performance loss ... so go on enjoy your sierra ui lags and blame software on the cheap hynix dude... while im using the same os without lags, or without performance loss, freezings...
Again, get this straight: You had some bad/out-of-spec Hynix RAM. You bought some non-bad/correctly-specced Micron RAM.

Glad you're happy now. But NEITHER of those two RAM samples were "leaky". (rolls eyes)

But please don't make yourself look like an idiot by trying to talk authoritatively about things you simply don't understand.
 
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