I'm dabbling with creating a stand-alone program which is like a Pogoplug Explorer, and I've noticed that if a file is renamed, either by using my.pogoplug.com or if you have the Drive application running, the file ends up with a different fileid, so in effect it is the same as copying the file and deleting the original. Indeed, that may be what these applications actually do.

In my program, I'm storing a "directory listing" of all the details of all the files that were on my Pogoplug last time that I ran it, so that I can flag up which files have been added, removed or modified since last time. I did this test to see if I could detect that a file had been renamed - if it had the same fileid I would know that it had been renamed, but it was still the same file. Because the fileid is different, my program thinks that the old name has been removed and the new name has been added.

By the way, it looks like the fileids are derived from the filenames, because if I rename a file, then rename it back again, it gets its original fileid back.