NETGEAR ReadyNAS 3138 1U Rackmount 4-Bay Network Attached Storage, Diskless (RN3138-100NES) Premium performance 4-Bay, quad core, Rackmount storage and backup for SMBs (NAS and SAN) Easy local setup, monitoring and management through the NETGEAR Insight app for iOS and Android (with ReadyNAS OS 6.x). Power Supply Internal 180W: input 100-240V AC, 50/60Hz Unrivaled 5 Levels of Data Protection  XRAID; Snapshot; built-in anti-virus; Bitrot protection; and cloud backup. Drive Types Supported SATA/SSD 2.5" or 3.5" Unlimited snapshots, thin provisioning, virtualization and all-inclusive disaster recovery with ReadyDR (no additional backup license required) 5-YEAR hardware warranty with Next Business Day replacement and unlimited technical chat support, 90 days of technical phone support