I've copied a bunch of large media files to an external hdd connected via USB. When I try to put them back on my notebook hdd (I open nautilus and move the files in F3-mode) I get a lot of hickups and the process can never be finished for any file. Something wrong with the external hdd?
As we discussed in the comments, it is still possible to transfer your files to your device with the terminal (instead of the gui), even when there are spaces in the device name. You can either escape it with
(If you are on 12.10 the new location is
Then use something like
which will give a detailed report about what is being transferred:
You could also use
Both methods should transfer your files correctly or give you a good idea of what the issue is, as they give much more useful information than when you transfer files with the gui tools.
If you still cannot transfer your files correctly, then I should consider William Bell's ideas to test the filesystem integrity on your disks.
There could be many reasons