D-Link DNS-321 2-Bay Network Attached Storage It is the perfect way to store, share, and safeguard your documents, music, videos, and photos With the D-Link tool-less installation, easily insert up to two SATA drives1 without any tools or attaching any cables Additionally, the built-in UPnP AV media server enables streaming of digital content to compatible network media players Bays: 2 x 3.5" - 1/3H Internal Includes: DNS-321 3.5" Hard Drive Enclosure, Power Adapter , Ethernet Cable , Quick Installation Guide , CD ROM with:Installation Wizard