Why can I no longer transfer files to an external HD?

To make more space on my 2010 macbook air (OS 10.9.4) I purchased a Toshiba 1TB external hard drive (formatted Mac OS Extended (Journaled). To free space I placed a large folder onto it, and also set up Time Machine. When I plugged it in a few days later, I get error messages saying that time machine backups failed (but they seem to be there) and I get the following when trying to move any other file from the computer to the hard drive:
Modifying “HARD DRIVE” requires an administrator name and password.
which it seems to initially accept the one I have for the computer, but then I get:
The operation can’t be completed because an unexpected error occurred (error code -50).
What might be wrong and how can I fix it?

Hey Martin Butcher,
Thanks for the question. After reviewing your post, it sounds like a Time Machine backup failed. If you click on the i in the Time Machine preference window it will give you an error message. If you could see what that message is this article might be able to help you get this resolved.
Time Machine: Troubleshooting backup issues
http://support.apple.com/kb/HT3275
Using an external hard drive to store backups.
Mount your external hard drive.
In Disk Utility, locate your external backup drive. Your backup drive should mount in the Disk Utility sidebar when attached to your Mac.
Select your external backup drive.
Click Repair.
Thanks for using Apple Support Communities.
Have a nice day,
Mario

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