You can populate this small NAS box with SSDs for low-power movie and music streaming. It even has the power to handle 4K video.

Small is good when it comes to NAS boxes designed to serve up audio and video over a home network. Synology’s 4-bay DS419slim, being built for 2.5-inch drives, is significantly less bulky than the average NAS box designed to accommodate 3.5-inch drives. The DS419slim is perfect for SATA SSDs (solid-state drives), which are nearly noiseless and generate less heat than mechanical hard drives.
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https://www.techhive.com/article/3396630/synology-ds419slim-review.html