Although IBM TotalStorage DR550 devices have been supported since version 4.5.0 FP2 of Content Engine, there is no upgrade path to move file stores that are on such devices from version 3.5.2 to 5.0.0. If you need to move the content of your DR550 fixed content devices from version 3.5.2 of Content Engine to version 5.0.0, contact IBM Support.