F5-221: POWERFUL HARDWARE: Apollo J3355 2.0GHz dual-core CPU, and 2GB of RAM (expandable up to 4GB). Dual 1GbE LAN ports with each reaching at 119MB/s read and 118MB/s write (network failover / Link Aggregation supported).
F5-221: AES hardware encryption engine encrypts shared folders and network data transmission to keep data from unauthorized access.
F5-221: Advanced Btrfs file system offering 71,680 system-wide snapshots and 1,024 snapshots per shared folder.
F5-221: Real-time hardware transcoding of up to two concurrent 4K video streaming.
D2-310: Adopts real SUPERSPEED USB3.1(Gen1) Type-C interface, the read/write speed is up to 410MB/s. Copy a 1GB video in only 2-3 seconds.D2-310 can support two (2) SATA hard drives, is compatible with 18TB 3.5 inch SATA hard drive, and has a total storage capacity up to 36TB.