FreeFileSync Forum

Error message reads "Consistency check failed for "C:\Program Files\FreeFileSync\Resources\Registered.dat Invalid checksum" I have been running the donation edition for ages then this came up today. I don't want uninstall/reinstall in case I lose my list of file matches. ...

Theoretically, files can have an identical checksum and still differ in content.
That is however very, very unlikely, and, as explained in said threads, not the reason why FFS does not use hashes.

... file from a cloud (and there was not much sense to do it as byte-to-byte sync was doing pretty much same and being quicker) With exposing of `md5checksum` property by gdrive for file object, we don't need to download a file anymore to calculate its checksum. The method would be slower than time ...

... tried again - this time it appeared to work but when I looked at the .log it had apparently failed again because the sync files didn't pass their checksum (yet the backup had worked fine the night before). I have attached my .ffd as well as the error.log file - could someone please tell me what ...

xCSxXenon,

Is there a way to tell free file sync to do a checksum after each file is transferred?

... check if they are the same. The -n flag tells rsync to do a dry run and not change anything. The -c flag tells rsync to compare the files using a checksum instead of just comparing the file sizes and modification times. Here is an example of how to use it: rsync -vnc /path/to/source/ /path/to/destination/ ...

... 2023-06-13 14.23.59 331.log or eventually SyncSettings 2023-06-13 14_23_59 331.log And by the way: what is that last 3-digit number? A checksum of some sort?

... of the changed file. Only if some service would be running on the remote machine that can provide FFS the momentary hash of the remote file, a checksum based approach could/would potentially be attractive. But as this is normally not the case, and depends on the remote file server, FFS can ...

... pasting the same file to a different location in the drive on both sides is still detected by the software upon comparing them again). Or is the checksum of the file tracked by the file every time a comparison is run? I've tried to read the documentation and search the forums before posting this ...

Delete that "sync.ffs_db" file and try again This has been fixed for the next release: FreeFileSync 11.28 ------------------ Recover from corrupted database file That was a regression compared to older releases. FreeFileSync will automatically overwrite a corrupted DB file, if the error i...

I'll just point out the "very often" bit, which you would think you should not be running into, very often:

I get then very often (not always!!) this error message: cannot be read, the file content is corrupt (invalid checksum)

Delete that "sync.ffs_db" file and try again

Hello FORUM!
I have (for a long time already) a problem
with "FreeFileSync" for Windows 10.
For more see attachment: .jpg file.
Greetings from Germany
Sigmund

... some self-created script-file via the FFS On Completion command line. That script-file should then determine which file to determine the md5 checksum of, and consequently do so.

Freefilesync is a very great file sync tool, I use it every day. And I use checksum file created by md5 command to check file integrity. when I use freefilesync sync some new file to cold storage disk，then I need to use md5 command create checksum. step1. use ...

... Consistency check failed for "D:\Utilities\PortableApps\FreeFileSyncPortable\App\FreeFileSync\Resources\Registered.dat". Invalid checksum --------------------------- OK --------------------------- so, how can I update my portable ffs? edit: it seems that I have to activate again, ...

The use of checksums [...] would not speed up the FFS comparison. Correct, but performance with checksums is much worse: While FFS is comparing file content it breaks on the first byte difference found. Using checksums on the other ...

I join in asking to add an option in the settings to speed up the comparison using the checksum method (perhaps in the donations package along with the other options for performance?). Open source projects using this approach are very fast: https://github.com/arsenetar/dupeguru/ ...

The zip file had an invalid checksum apparently. Still I couldn't reproduce the "Installer is damaged" error: the pkg was extracted fine on both macOS 12.3 and 10.15 (perhaps the error could be corrected by the extractor?). Fixed and re-uploaded.

... did not create/delete any .jpg thumbnail files. I think an improvement to the tool that can significantly speed up the processes is to create a checksum for each directory. If that checksum has not changed, then content of directory should be skipped for any update/mirror function.

Maybe the SMB protocol incorporates a checksum, I haven't checked.

Gotcha, that makes more sense, but is a little different than the original. Can't say for sure if that's how it's done or not

My point is that "Compare by Contents" should not be done on files of different size - they are different by definition.

Plerry isn't the dev, Zenju is, so he can't answer that question, I don't think. You say checksum is "just a concept" but then what is the point of your post??

Checksum is just a concept. Dou you compare contents of the files of different size?

The use of checksums is discussed many times (https://freefilesync.org/forum/search.php?keywords=checksum). FFS does not use checksums. Using checksums also does not make sense for FFS, as FFS only runs in one location (which does ...

Comparison speed by checksum can improved drastically by calculating checksum only for the same path and file size. File size comparison is already implemented, just modify the algorithm by adding checksum to the same size files.

... Size: 19,671 KB, alias 20,142,821 bytes md5: cedf4dd86e8b63a4ed1f9623c8bd2166 So, size is the same as for therube , checksum obviously different, as these are donator specific files. It seems your zip-file does not have the correct size (at 11,246KB). Simply re-download ...

I'm not sure what exactly file content check means in "Compare" options, does it mean file integrity and checksum checking? I'm asking this because I sometimes get corrupt files on my usb when copying with windows. I wonder if this program can do such errors detection ...

... reinstall FreeFileSync. Consistency check failed for "C:\Program Files\FreeFileSync\Install.dat" File content is corrupted. (invalid checksum) Any ideas as to how this might be solved. I would greatly appreciate any help. I apologize in advance if this is a repost of a similar problem. ...