BUG: Cannot write very large .tmp files (BackupWrite: Access is denied)

[v40boston]

I am running FreeFileSync v9.2 on Windows 10 64-bit.
I copied a Dell laptop directory containing 7.39
Gigabytes from an internal SATA disk to a USB 3.0
external disk attached to a USB 2.0 port on the laptop.
The destination directory on the USB disk was
empty and I used a Mirror operation to copy
the directory.

There were two files over a Gigabyte (an .iso and
a .rar file). One file was about 1.8 Gigabytes
and the other was over 3 Gigabytes.

During the Mirror operation, both large files
generated errors. Unable to write, no access
to the .tmp files in the target destination
directory.

At the end of the Mirror operation, I renamed
the copied .tmp files to their original names and
their content compared exactly to the
original source files.

So, the copy completed, but the errors
were reported and the files were not
renamed from .tmp to the names of the
copied files.

First time FreeFileSync has ever given
me any problems.

Thank you so much for a wonderful
utility. This is great software!
And thank you for continuing to
improve it!

[v40boston]

This error window keeps popping up to
report the problem copying large files
to an empty directory:


Cannot write file "N:\20170719\MyLargeFileName.819e.ffs_tmp".

Error Code 5: Access is denied. [BackupWrite]

[Gianni1962]

Try disabling the real-time protection of your antivirus before running the sync and re-enable it at the end.

[Zenju]

their content compared exactly to the original source files.

Error Code 5: Access is denied. [BackupWrite]

BackupWrite does more that copy the file content, but also lots of other metadata like ADS, sparse attributes. Most likely copying one of those attributes has failed.

[Zenju]

Probably the same issue as disccused here: viewtopic.php?t=4652