I am having problems when I am writing files to an external USB drive (HP Mybook) which is plugged into my TeraStation Pro. I can write files for a while then in the middle of copying files I get the error "The request could not be performed becasue of an I/O device error". I have reformatted the usb drive to make sure it was not a file system problem but I still get the same error.
If I power both the MyBook and TeraStation off and back on I can then resume copying files until the error comes back again.