IRVINE, Calif., May 30, 2013 /PRNewswire/ -- WD®, a Western Digital company (NASDAQ: WDC) and world leader in digital storage solutions, today expanded its product portfolio addressing small- and medium-sized businesses (SMB) with the addition of WD Sentinel™ RX4100, its first 1U rack-mount small business storage server. "Following upon the success of our first SMB storage server, the WD Sentinel™ DX4000, we are responding to customer and partner requests to expand our portfolio with a solution for customers that have a rack based computing infrastructure," said Thomas Gallivan, vice president of marketing for WD's SMB solutions group. "The WD Sentinel RX4100 delivers a unified storage solution that's easy to install, seamlessly integrates into Windows environments with Windows Storage Server 2008 R2 Essentials and offers complete data protection and secure remote access to a business's data." ConnectionWD Sentinel RX4100 is a simple and affordable way for SMBs to centralize and store all of their documents and digital assets in one secure location. While installation and setup is simple and intuitive, the product delivers enterprise-class features such as RAID protection, automatic server-based backup and restoration capabilities, redundant network and power options, as well as integrated network attached storage (NAS) functionality and iSCSI SAN capabilities for virtualized network environments. ProtectionWD Sentinel offers a complete data protection solution and helps safeguard SMBs against data loss. WD Sentinel RX4100 comes with Microsoft Windows® Storage Server 2008 R2 Essentials operating system and includes the software to back-up 25 Windows and Mac OS client computers in the network. The product features pre-installed WD hard drives, optimized for reliability, quality and performance, factory configured in RAID 5 for data protection against drive failure. Backing up and restoring stored data is automated with options for complete bare-metal backup and restoration of the entire system, as well as incremental backups and restoration for specific files. Mac OS systems can back up to WD Sentinel RX4100 using Time Machine® backup utility. In the event of a accidental data loss or computer failure, WD Sentinel's easy restore function finds lost files, and then quickly restores them to their previous location, or allows the customers to restore the entire computer image, including the OS, program files, data and settings.