Cumulative Update KB4512941 Windows 10 v1903 build 18362.329 - Aug. 30 Win Update

Try3 · 06 Sep 2019

hempatches said:

About two weeks ago I found the computer had downloaded and installed the Windows 10 May 1903 update and wiped all my files. First I tried restarting and got nothing. Tried again and nothing. My computer looked like I'd just bought it--totally empty, nothing left except my screen password prompt. Properties of the C drive showed it practically empty. So I went into Security and Updates and rolled it back to the previous version. Presto, back in the pink and no more crying.

I think you misinterpreted the symptoms. If an update rollback showed all your files again then they were there all along.

If you want to find an explanation, I suggest creating a thread of your own in which you describe each observable symptom and key facts about your setup such as the nature of the user accounts on the computer & the locations of the user files.

Naturally, you might not be particularly interested unless it happens again.

Denis

maurice naggar · 06 Sep 2019

@hempatches
Sticking with build 1803 is not something you'd want to do.
Follow the advice above from Try3 and post your details on the Windows Update sub-forum
https://www.tenforums.com/installation-upgrade/

It is important to dig out just what the issue was about the last upgrade attempt.

hempatches · 06 Sep 2019

Thank you IronZorg89. One question: When 1903 wiped my files, nothing and I mean nothing was retrievable, all folders were invisible /appeared empty. Entire system looked brand new. If this happens again after doing the differential backups, how will I find these backup images if I save them to the hard drive?

IronZorg89 · 06 Sep 2019

hempatches said:

Thank you IronZorg89. One question: When 1903 wiped my files, nothing and I mean nothing was retrievable, all folders were invisible /appeared empty. Entire system looked brand new. If this happens again after doing the differential backups, how will I find these backup images if I save them to the hard drive?

I cannot tell you exactly what happened to your folders; in the past there was this issue with files & folders disappearing with a Feature Update (not sure if it were this one; probably another member in the forum can chime in) but it is never a good idea to put your system image backup on the drive or partition you are backing up. An external HDD should be in order for system image backup. I use MR (Macrium Reflect paid version, but you can use the free edition)

kado897 · 06 Sep 2019

IronZorg89 said:

I cannot tell you exactly what happened to your folders; in the past there was this issue with files & folders disappearing with a Feature Update (not sure if it were this one; probably another member in the forum can chime in) but it is never a good idea to put your system image backup on the drive or partition you are backing up. An external HDD should be in order for system image backup. I use MR (Macrium Reflect paid version, but you can use the free edition)

There was a problem with lost data on 1809 but I don't think rolling back recovered it. Agree about using MR free edition. You can't do incrementals but you can do differentials.

IronZorg89 · 06 Sep 2019

kado897 said:

There was a problem with lost data on 1809 but I don't think rolling back recovered it. Agree about using MR free edition. You can't do incrementals but you can do differentials.

Thanks for the info. I was not sure which build (Feature Update) was involved with files & folders disappearance after installing it.

LOL!

kado897 · 06 Sep 2019

IronZorg89 said:

Thanks for the info. I was not sure which build (Feature Update) was involved with files & folders disappearance after installing it.

LOL!

If I remember correctly it was in the specific case that a known folder such as pictures had been relocated but there were still documents in the old location. These were lost.

IronZorg89 · 06 Sep 2019

kado897 said:

If I remember correctly it was in the specific case that a known folder such as pictures had been relocated but there were still documents in the old location. These were lost.

Good findings!

Brink · 06 Sep 2019

UPDATE 9/6:

New "Improvements and fixes" item added. See first post for more details.

Bree · 07 Sep 2019

This is an odd 'error' reported by SFC after installing KB4512941.

With SFC /VerifyOnly it reported that there were errors, but none are shown if you view the CBS.log as per Option Five in the SFC tutorial.

When SFC /ScanNow was used it reported a sucessful 'repair', but CBS.log showed this:

Code:

2019-09-06 22:56:45, Info                  CSI    000002aa [SR] Repairing 0 components
2019-09-06 22:56:45, Info                  CSI    000002ab [SR] Beginning Verify and Repair transaction
2019-09-06 22:56:45, Info                  CSI    000002ac [SR] Repair complete

Ater apparently 'Repairing 0 components' SFC /VerifyOnly now reports no corruption.

This is entirely reproducible. Start with a machine on 1903, build 18362.295. It may (or may not) be relevant that mine have had Disk Clean-up run to clean up update backups before starting this. Run SFC /VerifyOnly to ensure that no corruption is reported. if the known 'Defender ' issues are reported repair them with DISM, restart and run SFC /ScanNow to eliminate these before continuing.

Install the optional cumulative update KB4512941 (OS Build 18362.329).

At this point SFC /VerifyOnly reports no corruption.

Run Disk Clean-up to clean up system files, cleaning up the update backups.

Now SFC /VerifyOnly will report corruption and SFC /ScanNow will make zero repairs, which will 'fix' the alleged 'corruption'.