Synology DiskStation DS918+ is a 4-bay NAS designed for small and medium-sized businesses and IT enthusiasts. Powered by a new quad-core processor, DS918+ provides outstanding performance and data encryption acceleration along with real-time transcoding of 4K Ultra HD source contents. Synology DS918+ is backed by Synology's 3-year limited warranty. Synology DS918+ is a 4-bay network attached storage solution equipped with a quad-core processor and 4GB DDR3L memory (expandable up to 8GB). With Link Aggregation enabled, DS918+ delivers great sequential throughput performance at over 226 MB/s reading and 222 MB/s writing . With AES-NI hardware accelerated encryption, DS918+ delivers encrypted data throughput at over 225 MB/s reading and 221 MB/s writing. DS918+ newly supports M.2 NVMe 2280 SSDs, allowing fast system cache creation without occupying internal drive bays. DS918+ can support up to 9 drives when connected to one Synology DX5172 expansion unit. Storage capacity can be expanded according to your business needs with minimal effort. DS918+ introduces the Btrfs file system, bringing the most advanced storage technologies to meet the management needs of modern businesses: Built-in data integrity check detects data and file system corruption with data and meta-data checksums and improves the overall stability - Flexible Shared Folder/User Quota System provides comprehensive quota control over all user accounts and shared folders - Advanced snapshot technology with customizable backup schedule allows up to 1,024 copies of shared folder backups in a minimum 5-minute interval without occupying huge storage capacity and system resources - File or folder level data restoration brings huge conveniences and saves time for users who wish to restore only a specific file or folder - File self-healing: Btrfs file system can auto-detect corrupted files with mirrored metadata, and recover broken data using the supported RAID volumes, which include RAID1, 5, 6, and 10.