FreeFileSync Forum

Just saying...

2 min. vs. 4 min.
What if it were 20 min. vs. 40 min.?
Or 200 min. vs. 400 min.?

Other softwares allow designating/setting volumes, groups of volumes, as "single-thread", kind of thing.

b3sum has poor performance for large files on spinning disks, when multi-threading is enabled ...

What are your folder pairs?
Are said RAR files outside of said folder pairs?
Are said RAR files already on the target end (& the GUI is not showing == files, so it /appears/ that FFS is not seeing them)?

What were the original source / destination?
What were the shortened source / destination?

90 ...

(In my case, path-part is 267-chars + name-part is 255-chars.
267+255 = 522.
I'm on Win7, so no "LFN" Windows Registry setting that can be made.

name-part is limited to 255 max.
path-parts are also limited to 255 max, per part (I think it is, or maybe 260, but then you have to account for ... or ...

Well the _Setup.exe did install it, somewhere, maybe /Program Files/ or whatever.
If you went that location, i.e. "instalDir", & ran FreeFileSync.exe, does it start & run?

If it does, then at least the program is working.

Not being on the Start menu & whatnot, that is a different situation (which ...

_x86_x64, does that mean it is a 32-bit process?
Are you able to run the 64-bit version?

If so, does that work without OOM?

I see, "Help | Check for updates now".
(Don't know if there is supposed to be any "auto-update" mechanism?)

long path or file names

How long is long?
What OS (file systems) on source & target?

I've got

522-char full path length

C:\Local\SANDBOX\CLEAN\drive\E\Program Files\Mozilla Firefox 91.0\PROFILE\storage\default\moz-extension+++334f1b5b-4f41-4a3f-b743-0da5d57ee10d^userContextId=4294967295\idb ...

What happens if you run <instalDir>/freefilesync.exe (or <instalDir>/bin/FreeFileSync_x64.exe) directly?
Does the program open & run?

If not, I'll suspect (?) that the license file (registered.dat) keys in on <something> related to Windows itself, & when you reinstalled Windows that association was ...

Does it continue to work in with the current release, 14.10 ?

I'd be suspicious too.

If a file has a different size, left vs. right, it cannot be identical, so date at that point is relatively irrelevant.

And, it would prompt me to say, "hey, why are the file sizes different"?
And, given that date is identical, it would further make me ask, "heh, why are the ...

if the left file has the same modification date as the right file but a different size, I see it as a byte corruption case

This is something you have actually seen, & not just theoretical?

It does not compare file meta-data.

Were you speaking of ADS (Alternate Data Streams) here, aka, "meta-data"?
If so, then you would be correct that a hash compares a "file" (& not ADS).

Now what a content compare (VerifyCopiedFiles) does?
Does that verify both the "file" & the ADS?

(I may get ...

Seems like a perfectly logical request to me.
FFS copies ADS.
If there are different limitations on ADS on different file systems, they should be taken into account.

128 KB does seem to be the number for ReFS.
Didn't see a specific size for NTFS?

Create a 0-byte file.
Create a 1 GB ADS for said ...

The SHA256 algorithm only reads and evaluates the actual binary content/payload of a file.
It does not compare file meta-data.

And a content compare (VerifyCopiedFiles) does?

I would be very surprised if it did.
(I have never heard of a comparison program that does such?)

I would expect any ...

FFS frequently reports files as different, but a SHA256 comparison shows that they are identical. This could not happen if there were ANY differences.

That is very strange, & unexpected.
Is there anything, something a wee bit smaller then 80 GB, that this can be duplicated on?

(Not quite sure how it works on the business end, but...)

Are you able to load the "thankyou" page (or similar on business ?) & Remove the old machine, thereby allowing install on the new?
.

: FreeFileSync - REMOVE.png (69.42 KiB) Viewed 34 times

if the left file has the same modification date as the right file but a different size, I see it as a byte corruption case

Why would you assume that, byte corruption.
Actually compare the files & see if you can see what the difference is between them.

Maybe it is simply an additional nul (or ...

Have you verified that the files are identical - that they differ only by date, between C: & F:?

If you copy (Update or whatever) the same source files to another destination, not on 'Samba share (on a ZFSOnLinux backend)', do the files end up identical & also dated the same?

(To me, one uses a program because it works for them, not because some "package manager" supports it or not.

Never used Winget, or any "manager". Probably never would. I'd rather think & decide for myself, then offload it to some "manager" - even an auto-updater. Guess others are different ;-).)

Do you mean with an Update Sync?
If so, then yes.
.

[11:13:50 AM] Info: Synchronizing folder pair: Update >
C:\My Documents
\\Nas\back\RUBENXP43\My Documents
[11:13:50 AM] Info: Creating file "\\Nas\back\RUBENXP43\My Documents\IRS\f941-2026-03.pdf"
[11:13:50 AM] Info: Verifying file "\\Nas\back ...

> In Group or user names, mine didn't have "SYSTEM".

Have to assume that is atypical?

What pointed you to this fix?

> it was working fine for about 3 years and now suddenly it is giving this error, haven't changed anything anywhere

And that's odd too.
Might it have to do with onedrive itself, a ...

So I just read:

This was given to me from AI, it doesn't work and would appreciate the correct way to start syncing my...

And I'm thinking, great, AI, so no one no longer needs to actually think.

Which... made me think of this thread, cause when people stop thinking for themselves (which does ...

(Windows.)

If you're using Everything (& everyone should be),
you can simply search for 'ext:ffs_lock',
select them all, & Shift+DEL.

Everything - https://www.voidtools.com/

Or you could create a .bat file, using DEL (but you'd have to know just where to look...).

.
FreeFileSync - ffs_lock.png ...

What does it do (when you attempt to delete)?
Any messages given?

Just noting that cloudflare spit out some... message, the first number of times when I went to view this site this morning. (Don't know what changed, to let me in?)

Well if you leave * in there, then it will pick up other items aside from your explicit files that you want.

(You can add it in, or remove it, run a compare & see - before doing any sync, just what will or will not be included.)

That said, rather then including a few specific files (like; places ...

So what, you're on Win7, & with 14.9 you're relegated to the x86 version?
(And where older version could use x64.)

(Oh, yes, that's it. I should have followed the link in Zenju's post, first ;-).)

WinMerge, set View to, 'Show Left Unique Items' & 'Show Right Unique Items', I'd think would do it.
(Now, the actual layout isn't too understandable [to me], but the data should be there.)

(I believe, though free, the /installation/ is still tied to a particular machine.
And when you blanket /copy/ the installation directory, onto a different machine,
it sees this mismatch.

And it asks you to reinstall your OS?
I'd think it would ask you to reinstall FFS, only.
[And of course, backup ...

Towards the bottom of the FFS window, what does it show for
'Showing # of # items' ?
.

: FFS - showing # of # items.png (6.14 KiB) Viewed 140 times

Are you sure that the particular files in your file list do have icons?

Do the same files display icons in Windows Explorer?

Here are some (including some dups).
.
[Zenju, 2026-4-07: removed. Please don't share them]

I just wonder whose birthday is on 6/20 ?

Is the RTS being run as a Scheduled Task?
If so, see viewtopic.php?t=12995.

however rare, it is more than possible for two totally different files to have the same size

I have 33,265 "picture" files that meet that criteria.
.

(On Windows), the Index Journal ... logs ... stuff.
If you had a utility to read the Index Journal, might be able to do something on that end?

Everything 1.5a, can monitor the Window Index Journal.
(1.5a does not have an ARM version [yet, though I'll suppose at some point it is intended ...

You could use tasklist.exe to see if FFS is already running, & then do or not do something after that.

(as a start, something like)

tasklist.exe /fi "imagename eq freefilesync.exe"

(& then you'd do something after that based upon whether FFS was found or not)

https://freefilesync.org/forum ...

(Don't hold me to it, but I believe that is dated, & there is no longer an actual uninstall.sh included?

Looks like it was nothing more then to verify that FFS is not running, then simply removing the program parts/directories & desktop shortcuts.)

You could see if prefer IPv4 over IPv6 might work for you?

https://community.illumio.com/s/article/Changing-Windows-Workloads-to-prefer-IPv4-over-IPv6
https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-ipv6-in-windows

-

ncpa.cpl (from command-line, or maybe from ...

Current versions of FFS are limited to (FFS) 32-bit .exe's on Windows 7.

FFS v14.5 was the last version where x64 worked (& also where the VSS feature worked) on Windows 7.

> Windows Explorer doesn't immediately show all the directories on the NAS-share mounted as a drive

Even though WE may not see it (the mapped drive letter - yet), are you able to type in the UNC path (into WE) & have it open it (immediately)?

(I hate [Windows] networking, & often when "Network ...

In what way is it wrong?
If you change it from 600 to say, 9, does it not set the interval to 9?
Is the delay not set to 9 in the .ffs_real?

> and then it stopped

To be clear, the sync is not running at all (rather then it executing but not finding any files to sync).

(IMO) If ones Compare is Time & Size, one is much more likely to run into situations where Time & Size (with size displayed as KB...) that you may end up questioning why a update to a file is wanting to occur when the files on each side are the "same" time & "size.

Everything has a problem in ...

> FreeFileSync reported always different amount of files which supposed to be different (rarely none).

Odd (IMO).

So I ran a scan, Content compare (which I don't typically do), ~40 GB of data (so smaller then your dataset).

20th Century. Same size, day/month .happen. to be reversed, target being ...

Shouldn't happen.

What type of scan are you running?

Are you sure you are in fact (externally) binary comparing the same pairs of files (that FFS is comparing)?

Is this Linux? If so, what version?

(I am not seeing the same on Windows, as Safely Remove works as expected.)

(I have no knowledge of gdrive...)

Are the files within the GDocs, GSheets & GSlides "directories" solely .docx, .xlsx & .pptx. files?
(Or are you apt to have any general file type in said directories?)

If the former, could you run a post sync command that renames any files in the G directories ...

Can you just redirect output to nul (/dev/nul)?

go.bat > nul

Would something like that work?

> In my nightly sync jobs

Am I right in assuming that this only happens if you use Windows Task Scheduler?

As in, when I run directly from command-line, C: prompt, I'm not seeing any additional output ...

When the target hard drive has cluster size bigger than the sync.ffs_db file itself, the FFS fills the remaining empty space with 0x00

If it does that with sync.ffs_db, wouldn't you expect it to do that with all files where size < cluster size?
Yet, it does not - is that so?

If you did something ...

How about:

*\.dtrash\

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