Error_Access_Denied Accessis denied(CopyFileEx)

[Mearnshowe]

Can someone explain why I get this error when copy 1.6Gb of Folders to a new USB attached 4Gb Portable drive. I have administrator rights and checked security and permissions. Copies the bulk of the data and fails at the end with the above error message. Windows 10 64Bit.

[Gianni1962]

This error may also be the result of an open file.

What is your antivirus?
Try to sync with the antivirus disabled.

[Mearnshowe]

Trend Micro Maximum Security is my Antivirus. Can't think any files are open, but will investigate.

[Gianni1962]

I meant opened by a real-time virus-scan

[Mearnshowe]

Problem solved, the antivirus was obviously checking files as they were being copied and blocking there progress. Software works a treat and saved a power of work. Is there anyway to educate the Antivirus that freefilesync is bonified and legit and allows it to work unhindered?
Thanks for the quick reply earlier.
Regards
Douglas

[Gianni1962]

If you press Retry when the Access denied error pops-up, does the sync complete successfully?

I don't know of a way to tell your antivirus not to scan files copied "by" a particular app so the solution eventually is disabling the real-time part of your antivirus for the time needed to do the sync.

The problem is not FreeFileSync.exe's reputation but is the real-time scanning on the copied files when the write completes on the destination disk.

FFS first copies the file with a .ffs_tmp extension, then if the copy is completed without errors, it deletes the old file, if any, and rename the copied file with the extension .mov.

Probably the real-time scanning takes place in the mid of those operations, and due to the file dimension it needs a consistent amount of time thus impeding FFS to complete its things.

[xCSxXenon]

Get rid of third-party and bad antivirus, problem solved