error:(oid 0x39f3) fsroot tree invalid

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MrErrington Author

Level 1

8 points

error:(oid 0x39f3) fsroot tree invalid

Hi

So i'm currently waiting for os catalina to re-install after messing around for a couple of days..

Problem: I have a large photos folder, which became unresponsive.. first aid identified the problem to be;

error:(oid 0x39f3) apfs_root: found zeroed-out block fsroot tree is invalid.

as i say i'm currently re-installing the os.. but i'm curious as to;

1) what to do if reinstalling os doesn't work,

2) why this happened,

3) how else could/can i have remedied this..

as background.. i was uploading photos(larger format than usual between 40 and 170mb each). computer when to sleep and unmounted the usb before the operation was complete. following this the folder wouldn't open properly, and i couldn't view its contents, although eventually after running first aid and changing the viewing options.. i then deleted the images i thought may have caused the problem.

This didn't seem to help.. so i ran first aid again.. it then started giving me to title error message.. i tried looking the code up but couldn't find any info.. it also wouldn't fix it even in recovery mode...

I've just re-installed the os, but as it finished it notified me "could not create a pre boot volume for APSF install"

its currently taking ages to load up,,

has anyone had this before? or can shed any light on what is going on?

MacBook Pro 13″, macOS 10.15

Posted on Mar 13, 2021 11:23 AM

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Answer 1

Top-ranking reply

HWTech

Level 9

60,632 points

Mar 13, 2021 4:54 PM in response to MrErrington

If First Aid is unable to fix the errors, then you will need to erase the whole physical drive before restoring from a backup or clone since there are no third party utilities available to repair the APFS file system since Apple hasn't released the necessary APFS documentation yet. Keep in mind erasing the drive will destroy all data on the drive.

If you don't have a backup why not? It means you have to go through a lot more trouble now to attempt to recover the items on your computer. The easiest way is to install macOS to an external USB drive and boot from the USB drive so you can attempt to transfer your important files.

Things become damaged or corrupted for any number of reasons. APFS is a relatively new file system that still has some kinks to work out. Unfortunately First Aid is only able to repair the most basic of issues (First Aid has always been terrible at repairing file system issues).

You should always have frequent & regular backups of your computer and all external media that contains important & unique data. FYI it is impossible to recover accidentally deleted data from an SSD after the Trash has been emptied plus an SSD can fail at any time without any warning signs.

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Answer 2

MrErrington Author

Level 1

8 points

Mar 14, 2021 5:39 AM in response to HWTech

@HWTech I thought it might come to a erase start again, as much as I hoped there might be a chance of a solition.. The info about the APFS being new was very helpful,, as I was confused as to why there were articles about fs_root failure, but none seemed to share the same code.. it makes sense if the information isn't available to decipher the error codes..

And yes you were correct, it was too complex for First Aid to remedy..

As for back ups, of course I had! hahaha this isn't my first rodeo, it was all present in some form or other, just not in a single place.. I learned that lesson while half way throuh me dissertation a decade ago, lol.

As for SSD I still have a standard hard drive in the computer, and multiple externals as backups, the only SSD i use are the cards for the cameras,, and they get backed up frequently...

I guess I was hoping to find out if the fs_root error could be attributable to anything I'd done directly, or was common under any particular circumstances so i can avoid it in the future..

Thanks again for you advice

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error:(oid 0x39f3) fsroot tree invalid

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