Hello,

Odd errors like that are usually an indication of a disk that has become read-only or somehow the index of files the Pogoplug thinks is on the drive is not reality.

Please safely eject your drive from the Pogoplug via the WebGUI, connect your Drive to a PC/mac and have it scanned for errors, then reconnect it to your Pogoplug.

If this doesn't solve the problem, then safely eject from Pogoplug again, connect to PC/mac and remove the folder ".cedata". This folder is usually marked hidden so you'll have to be familiar with how to unhide hidden files on your computer. At the root of the drive is where you will find this folder. Delete it. Don't delete the ".ceid" file though.
Reconnect the drive to the Pogoplug. The Pogoplug will notice that folder missing and rebuild it, re-indexing the files.

The only limit to the Pogoplug is your imagination... and C skills... and linux skills. ^_^ h\t\tp://download.pogoplug.com/opensource/pogoplug-gcc.tar.bz2