File placement in General Posted June 6, 2014 Lee, In StableBit DrivePool there is no notion of "main" file parts and "duplicated" file parts. We just have some number of identical file parts for each file. Unduplicated files have one file part, and duplicated files have 2 or more. Where those file parts are placed can be controlled with file placement. If you tell the balancing system to place a 2x duplicated folder on one drive, it will show you a warning that some file parts could not be placed on that drive. For a 2x duplicated folder, you need to select at least 2 drives in file placement in order to be able to satisfy those rules, or else the system will have to violate the rules. But I still think that you can accomplish what you want. If I understand you correctly, you want all of your music to be duplicated and to play from only the "first" file part. You can achieve this by using file placement to restrict the music folder to at least 2 drives and then to turn off Read Striping (under Pool Options -> Performance -> Read striping). I've mentioned above that all file parts are the same, so how could there be a "first" file part? For the purposes of read striping, when dealing with files that have > 1 file part, StableBit DrivePool's file system (CoveFS) does maintain a deterministic pool part order. In other words, the disks part of the pool are ordered in an invisible order and this order persists even after a reboot. The point being, when read striping is off, and you open a duplicated file, the "first" file is always opened.