#493 ERROR: CRC Failed, System ERROR: Error #20000002

[Torsten Funk]

Hello everybody,
I run a daily backup over my personal folders by updating a monthly backup file. At one point the console window shows me an error message regarding a PDF file on disk:

ERROR: CRC Failed :
{filepath}
System ERROR:
Error #20000002

The update process is then aborted without a notice, the .7z.tmp gets deleted, and the .7z file remains unchanged. The error message is not mentioned in the log file, neither a warning, but the line "Everything is Ok' is missing.

I updated to latest version 7z2301-x64, still under Win7 64-bit Pro.

a) What does this error message means?
b) I think the console should give more details about the error and that the update process got aborted, and this also should end up in the log file also. Otherwise one easily misses the error and trusts everything is OK, since backup runs mostly in the background.

Any ideas on this? Many thanks in advance!
Friendly greetings

Screenshot:

Logfile:

7-Zip 23.01 (x64) : Copyright (c) 1999-2023 Igor Pavlov : 2023-06-20

Open archive: {path}.7z

Path = {path}.7z
Type = 7z
Physical Size = 9697476191
Headers Size = 628220
Method = Delta LZMA2:26 LZMA:20 BCJ2
Solid = +
Blocks = 17

Scanning the drive:
6597 folders, 50547 files, 12102922726 bytes (12 GiB)

Updating archive: {path}.7z

Keep old data in archive: 6595 folders, 50547 files, 9711192226 bytes (9262 MiB)
Add new data to archive: 7 folders, 18 files, 2419737525 bytes (2308 MiB)

[Igor Pavlov]

When you update "solid" 7z archive, 7-zip needs to repack some blocks.
So it unpacks some block and checks CRC of all files in that block, and it repacks some data back to updated block in new archive copy.
That process was stopped because of crc check failure in your case.
It can be corrupted archive, bad ram/hardware, or maybe it's bug in 7-zip.
Call

7z t path.7z

also check ram and disk.