Hi there, so I've just got an external hard drive for backup and file transfer purposes. ('1tb Western Digital Mybook for mac'-if anyone cares). I've spent the past two days backing up all my files from my Mac Pro and my MacBook Pro using Time Machine. I then wanted to copy a few files from the backup of the Mac Pro onto the Macbook Pro's hard drive only to find that every time I tried I got the message: 'The operation can't be completed because you don't have permission to access "insertfilenamehere".' I have been into the main directory and hit 'cmd+i', unlocked, changed 'admin'-'user'-'everyone' privileges to 'read & write' with no change in the result. What do I do guys?