For an always-on device you would actually fare better with an SSD than a 2.5" laptop hard drive. Laptop hard drives are not meant to be always-on. The bearings

For an always-on device you would actually fare better with an SSD than a 2.5" laptop hard drive. Laptop hard drives are not meant to be always-on. The bearings tend to wear out very fast unless they spend a fair amount of time spun-down. 3.5" desktop hard drives, 2.5" server drives, and SSDs have much better mechanical reliability in that respect.