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Strange problem when copying files to NAS

Hello all. I have a strange problem when trying to copy files from my intel iMac to my Seagate NAS. I am copying files from my HD and when the file is nearly copyied i get an error message saying that the file can't be copied because it is already in use by another application. Well... it surely isn't. I try copying them by ftp (Filezilla) and everything works fine. I can then access them through my media server but !!!! NOT THROUGH MY iMac!!!! It is like the files are not there!!!! But they definetely are! I tried fixing the disk permissions, rebooting NAS, iMac etc but nothing seems to solve the problem. Is there any suggestion of what might be wrong? I am under Mavericks and i am pretty sure that the problem started after the update. When copying from my external USB hard drive to my iMac HD everything works fine. The problem is from my iMac to my NAS.

iMac, OS X Mavericks (10.9)

Posted on Nov 1, 2013 1:34 AM

109 replies

May 4, 2016 2:27 AM in response to sardo007

Dear All,

the problem is fixed in OSX EL CAPITAN. The error disappears if you upgrade your computer to the new OSX.

May 4, 2016 2:35 AM in response to deltamc15

Please upgrade your OSX from Yosemite to OSX EI CAPITAN.. You will be able to copy more than 4 GB file to the same NAS.

May 8, 2016 10:40 AM in response to deltamc15

I know this thread is years old, but I had the same issue and found this thread from google. I was copying movie files (MP4) from my Mac to a NAS drive and kept getting the error "cannot copy file x because file is in use." I tried unchecking the "display preview" from preferences after right clicking on the file, but that didn't change anything. Turns out it wasn't the icon being displayed on the host computer that was the issue. The issue was that when you copy to the NAS, the MAC tries to build a preview at the copy destination while it's still copying, so the Mac is already trying to use the file before it's finished copying it to the NAS. If drag the file onto the folder at the destination rather than to an open folder with previews visible then it works.

Dec 6, 2016 10:44 AM in response to DebafromDar

Sierra has the same problem.

Mine solution was to change SMB sharing over to AFP, then the copy worked. And the server was a SYNOLOGY box...

Strange problem when copying files to NAS