The BA NAS 110 is basically a single-drive version of the BlackArmor NAS 220, available in 1 (tested) and 2 TB versions. The 3.5″ Seagate ST31000528AS Barracuda 7200.12 SATA drive is not user-replaceable.
The NAS 110 shares all of the features of its two and four-drive siblings (except for RAID), which include SMB/CIFS and NFS network filesystems, optional volume encryption, immediate or scheduled backup to / from attached USB drives & rsync servers and UPnP AV / DLNA, iTunes media servers. See the NAS 220 and 440 reviews for full details.
