Hitachi Global Storage System has now taken the veil off not one but two 4 TB storage solutions, the Deskstar 5K4000 3.5-inch hard drive which we mentioned on Friday, and a 4 TB Touro Desk external drive. The 4 TB Deskstar HDD features a 3.5-inch form factor, a SATA 6.0 Gbps interface, 32 MB of buffer, it utilizes the CoolSpin technology (~ 5900 RPM) and is currently shipping in limited quantities in both OEM and retail versions. The retail package, which includes the drive, mounting screws, and install instructions, costs $399.99. The 4 TB Touro Desk is equipped with one Deskstar 5K4000, has a black, textured body, a USB 3.0 interface, and offers 3 GB of cloud storage for free from HitachiBackup.com. This drive will ship in January and will cost $419.99.