http://wiki.covecube.com/StableBit_DrivePool_Utilities
try the ntfs permissions
Reset NTFS Permissions on the Pool
Resets all NTFS permissions on the DrivePool pool. This will also empty the recycle bin on the pool if there is one.
Use this if DrivePool shows 'Access Denied' errors when maintaining the pool.
After the fix, open the Dashboard to 'Server Folders' and set permissions for each folder on the pool. You can do this by selecting a folder and clicking 'View the folder properties'. Note: This sets the pool into a "clean" state, that mimics the permissions of a clean, new disk. Note: After doing this, to ensure proper user access, please use the Dashboard to change the permissions on the shared folders