The CloudStation Pro Duo has one USB port for external disks. It doesn't support USB hubs, so you can only connect one device at a time.
Only the first partition of the connected external disk is going to be accessible. The CloudStation Pro Duo can read from and write to FAT32, NTFS, EXT2/3, XFS and HFS+ partitions. The external disk is available over the network in a shared folder named "usbdisk1". The folder's access rights can be modified.
USB disks are used for two of the NAS’s features: Direct Copy and USB Backup. The former allows you to copy data from the external disk to a specified shared folder on the NAS by pressing the back-panel Function button. It only supports multimedia files of certain types and sorts them out automatically into subfolders named "movie", "music", and "picture". The USB Backup feature is for copying data in the opposite direction, i.e. from the NAS to the external disk. You can specify its operation schedule and source disk (one or two, depending on your configuration, but not individual shared folders).
The status page doesn’t have much information to offer: device name, firmware version, date and time, and network addresses. Like its predecessor, the CloudStation Pro Duo has no integrated log file but can send email notifications about any problems in its operation. The notification feature uses Buffalo's own servers, so you only have to enter recipient addresses. The integrated clock can be synchronized via the internet after choosing a time zone.
The NAS’s firmware can be updated via a special utility or automatically. There is only one option for working with the NAS’s configuration: resetting it with or without deleting all data. The maintenance section also offers a button for scanning the disks to build a new media server catalogue for viewing in the cloud service browser.
You can specify a schedule for the NAS to work by: one time interval per day with 15-minute precision. Take note that you specify the period of sleep rather than work here.
Setting the power switch at the Auto position may hinder the NAS’s operation in cloud mode: the NAS will only work when there is a PC running NASNavogator2 on the LAN. If there is no such PC, the NAS will shut down automatically after a while.
The main extra feature of the CloudStation Pro Duo is its integration with the Pogoplug service. We'll discuss it in the next section.
Besides the above-discussed support for external disks, the default firmware only offers two more services: Mac OS X's Time Machine utility and BitTorrent. The latter protocol is supported by means of a specially optimized version of uTorrent 3.0. It is a very fast client (we had a speed of 7 MB/s and higher) with flexible management options.
As opposed to the Windows version, it cannot work with multiple folders. The rest of the options are the same as in the original uTorrent: you can choose port numbers, enable UPnP support, specify limits for speed and the number of concurrent connections, enter file seeding options and an operation schedule, download torrents partially, assign priorities and read RSS feeds. Download jobs are managed via an individual web interface that can be protected with a password.
There is no official way of installing additional software on the CloudStation Pro Duo. You can find instructions on how to get console access to it, but you need a special version of firmware, which may be risky. The second way is to connect a cable to the connector on the PCB and access the NAS via ssh.