Can´t copy files from my backup-disk (usb)

Hi
I´ve a strange experience with my external USB-Drive. I formated it with Mac OS Extended (Journaled), copied my files onto it and everything worked fine. Now I tried to move some files from this disk back to another, but it does not work. I can´t move any files, even not on the same disk (for example into another folder).
First thing I took care is the Informationfield, but all rights were as they sould be on "read and write".
Strange is: I can read these files (for example I can play a file in Quicktime), and make a copy in the same directory, but I can´t move or copy them into another folder or onto another disk.
Anyone knows about this problem and how to solve it???
Thanks a lot

Bless you Malcolm. I had been assuming my disks needed repairing and was very dejected when the problems persisted after repair. I learned a lesson - to be more disciplined in naming my files - short and sweet!
Thanks to you I can now copy weeks of hard work to master back up.

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