The "Other" and "Unusable" sizes displayed in the DrivePool GUI are often a source of confusion for new users. Please feel free to use this topic to ask questions about them if the following explanation doesn't help.   Unduplicated: the total size of the files in your pool that aren't duplicated (i.e. exists on only one disk in the pool). If you think this should be zero and it isn't, check whether you have folder duplication turned off for one or more of your folders (e.g. in version 2.x, via P