you can always use patchburn. but it might not allow for full operation of the drives capability's. but normally one would wait for a OS update to add official driver support for the drive. i dont know what drives are officially supported in 10.4.11.
i know that my DVR-110D wasn't officially supported until 10.4.3 (where you didn't have to use patchburn). the only option if the OS dont support the 115 models is to use patchburn. or upgrade to leopard in hopes official support for this drive is there.