External hard drive networked via AirPort Extreme gives "The operation can't be completed because an unexpected error occurred (error code -50)" roughly every two days

My lab has about 10 Mac computers. We all access a central hard drive by the way of wifi provided by AirPort. It's just a regular external hard drive (Seagate Desktop Drive) that I turned into our central storage space by plugging it into AirPort (USB). It works pretty well. We seem to be fine with viewing the file directories, opening files, saving, deleting etc., for a day or two. But then after a day or two, when when trying to modify files or move new files onto the central hard drive, we get the error message: "The operation can’t be completed because an unexpected error occurred (error code -50)"
Any suggestions as to what may be causing this problem?
All of the computers are 2011 iMacs & MacPros. The AirPort is 802.11n WiFi. The hard drive is a Seagate USB 3.0 Desktop Drive.
Thank you for your insight/suggestions.

Thanks for your reply. I agree about the communication issue. Let me explain my setup and what I am trying to do and perhaps you can answer my questions or make suggestions.
I have a MAC Mini with a Sony TV for the video monitor. The Mac Mini is hard wired to the AE (Airport Extreme). The AE has a 2 TB HD hooked up to the USB Port. I have a 17" Mac Book Pro on the WIFI Network.
I am trying to use the MAc Mini as a "Media Server" of sorts. Once I get iTunes running the way I plan I am goign to hook up my Apple TV (2nd Generation) to my television downstairs.
What I am trying to accomplish is have iTunes on all my computers look to the External HD on the AE for the files. This is why I am having my (-50 errors).
So far I have noticed that if I go and try to download from iTunes purchased videos that are not ont he computer (to the external HD) it will also occassionaly give me teh -50 error.
Is there a way to change where the files go when I download them? Say I want to download videos to the computer but not to the external HD? However I would want to still be able to move them to the External HD.

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Karin

Have you tried putting the file from your Drobo, onto your computer, then onto to the external hard drive?

I tried to empty the trash, full of back up file from my hard disk and it just says: "The operation can't be completed because an unexpected error occurred (error code -8003)"

I have an external hard disk of 319.73 GB that I use as back up memory and where I put all the movies and other files that I can't leave on the computer as they occupy too much memory space . One day I was deleting all the previous dated back up to have more space on it , but had to stop the trash for doing it cause it was taking too long and now every time that I try to empty the trash it just says "The operation can’t be completed because an unexpected error occurred (error code -8003)" and even if I press CONTINUE it won't empting it . I'm not really pratical with this things and I tried already to find out the solution here and on Google but apparently nobody ever had a similar error code and I don't know what else to do.
I've a MacBook Pro with a Mac OS X 10.6.8 Version.
Thanks again for the help and sorry if I did some english mistakes !
PEACE & LOVE

Hey donnie90,
It seems like this article might be the best for helping you address this issue:
You can't empty the Trash or move a file to the Trash
http://support.apple.com/kb/ht1526
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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Can't save multiple folders to external drive. Get: "The operation can't be completed because you don't have permission to access some of the items." when dragging large folders to mac os extended journalled external drive from OS 10.6.8

Hi
I am feeling VERY desperate!
After losing an external drive [dont ask....] -   I got another one : 2TB WD formatted properly [ OS extended journalled for mac ] ready for action to move my thousands of files and images and ppts in hundreds of folders across from the laptop to this drive because I travel a bit with the laptop and this is too risky not to back up at home.
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I have dragged-copied various small folders and files across successfully, but it is only working 50:50 and I can't leave machine with the idea of things copying eg: overnight - it just won't work....
I have been browsing google and find some people describing in CODE how they overcome this 'message'   .... but I [and I guess some other viewers of this in future & also in desperation] would need instructions for beginners.... to try this type of thing. I don't know any code.
How can this be happening - I feel ANGRY at APPLE !!!! for not posting easy fix instructions yet re; this, or better still updating software so it doesn't happen [ that I can find at least !!! ] .   There seem to be hundreds of people stuck with this stupid message and inability to back up their projects etc.
Can anyone help ?
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hi Samberl
thanks a lot for the fast reply.
I was dragging folders from main folders on the laptop-desktop onto the external drive icon - to copy them across....
Your suggestion sounds very promising - I didn't know about 'cloning'.
Yes the idea is to backup the laptop -    I thought I would just move it all now, new - and then keep saving/dragging physically   across to the new drive myself each day or two...
Would this be the sizeof the internal hard drive = c.500 gb ?   =   under the HD icon on desktop is written :
" 499.76gb , 311.5 gb free "
I can erase and start agin on the new external drive - so this plan is to make two partititions, rather than the one at present, and make one of them 500 gb ?
I have found CCC [carbon copy cloner] googling - looks good.
When CCC site says it backs up the hard drive - would this mean all my files [over 100 gb] that are mostly in folders on the desktop, plus the others in itunes, iphotos etc found in the HD icon, would all copy across successfully [wherever they are in the computer ] ?
thanks again, hope you can clarify these things and then I will go for it.
It would be great and amazing if this 'lack of permission' message doesn't show up in the process of doing this ccc transfer - hopeful!
Julie

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

The operation can't be completed because the original item for " your drive name here " can't be found

Hey all,
I hope someone can help. I am running 10.7.5 OSX currently on my Mac Book Pro. I recently got a new Windows 8 desktop. A ceap one running Windows 8. I currently have 5 drives shared over my home network. 3 are working just fine (the 3 I just put on the network today). The other 2, however, were previously on my old Windows Vista computer also shared over my network. My Mac Book Pro had access just fine (I set up sharing on my vista comp) and everything ran smooth. Today when I hooked up my new Windows 8 computer and put the 5 drives on and shared them via my network, same way as I done before, 3 are working fine but the two original drives give me an error when I try and access them from my Mac over my home network. They both show up with the correct names but when I try and access them it tells me:
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I am having the same exact issue and I've been busting my testi-balls to figure it out. I've got 15 years experience in the computer game and still can't figure it out. I see a lot of people having similiar issues, but no one seems to have an answer for MY issue, which is virtually the same as the OP.
Brand new Macbook Retina.
Windows 7 x64 Machine.
ALL drives shared with ALL permissions of ALL accounts manually inserted on the Windows 7 side.
ALL other PC's in the house can access the drives on the Windows 7 machine without issue.
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PLEASE, if anyone finds a fix for this, let us know!

External hard drive networked via AirPort Extreme gives "The operation can't be completed because an unexpected error occurred (error code -50)" roughly every two days

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