How to Plan Your Plex Media Server Storage

Updated: 2026-04-29

Last updated March 2026 · 9 min read

Building a Plex media server is one of the most common reasons people buy a NAS. But how much storage do you actually need, and which RAID configuration makes sense for media? Let's plan it out.

Try it yourself! Compare RAID configurations with your drive sizes.

Open RAID Calculator →

How Much Storage Do You Need?

This depends entirely on your library and quality preferences. A typical 1080p movie is 4-8GB (compressed). A 4K HDR movie is 40-80GB (high quality remux). A TV season in 1080p is 10-30GB. Music is negligible in comparison – your entire music library probably fits on a single drive.

Rough estimates: a 200-movie 1080p library needs about 1-2TB. A 200-movie 4K library needs 10-20TB. 50 TV series (multiple seasons) in 1080p need 5-15TB. A mixed library with some 4K content typically lands in the 10-30TB range.

Plan for growth. Media libraries only grow – you will not delete movies. Buy more capacity than you think you need today.

Which RAID for Plex?

Media files are large, sequential, and mostly read-only. This means RAID performance is rarely a bottleneck for Plex. Even a single drive can saturate a Gigabit Ethernet connection for streaming. Your RAID choice should focus on capacity efficiency and fault tolerance, not speed.

2-3 drives: Unraid or SHR-1. Both handle mixed sizes well (great for gradual upgrades) and give you single-drive protection.

4-6 drives: RAID 5, SHR-1, or Unraid. Good balance of capacity and safety. RAID 6 or SHR-2 if the rebuild risk with large drives concerns you.

8+ drives: RAID 6, SHR-2, Unraid with dual parity, or RAIDZ2. At this scale, the probability of a second drive failure during rebuild is no longer negligible.

Transcoding Considerations

Plex transcoding (converting video on-the-fly for devices that can't play the original format) is CPU-intensive, not storage-intensive. However, if you enable Plex's "Optimized Versions" feature, it creates additional copies of your media – doubling your storage needs for affected titles.

Plex stores its metadata and thumbnail cache separately from your media. This cache can grow to 10-50GB+ for large libraries. Consider placing it on an SSD for faster library browsing.

The Budget-Smart Approach

Start with 2-3 drives in Unraid or SHR-1. Use our RAID calculator to compare your options. Add drives as your library grows. Unraid and SHR make this trivial – just pop in a new drive and expand. With traditional RAID, expansion is more involved.

For the drives themselves: media files are large and sequential, so even 5400 RPM NAS drives (like WD Red Plus or Seagate IronWolf) perform perfectly. Save your money for more capacity rather than faster RPM.