03-31-2020, 08:54 AM
The 4K playback itself would work from any hard drives and RAID configuration. But I have to say, SSD is improving fluidity of Plex interface. Plex app is able to cache things faster which improves overall performance. I have even seen improvement in transcoding process. If you can afford SSD price and you will have sufficient space for storing all your media, then I would recommend SSD. Otherwise it will still work with any HDD (NAS drives recommended). I hope this helps.