HDD vs SSD for NAS
HDDs have dominated NAS storage for decades thanks to their unbeatable cost per terabyte. But SSD prices are dropping and all-flash NAS builds are becoming viable for some use cases. This page compares both technologies side by side, sorted by price per TB, so you can make the right choice for your specific NAS workload.
The NAS storage trade-off
A 4-bay NAS with 16 TB HDDs gives you 48 TB raw for roughly $800–1,000 in drives. The same 4 bays with 4 TB SSDs gives you 16 TB raw for $1,200–1,600. HDDs deliver 3–4x more usable storage per dollar. SSDs deliver silent operation, lower power draw, faster random I/O, and no vibration concerns. Most NAS builders choose HDDs for the data pool and add one or two SSDs as cache.
Quick Verdict
- Who this is for
- NAS builders deciding between HDD-based, SSD-based, or hybrid storage configurations for Synology, QNAP, TrueNAS, or Unraid.
- What usually wins
- HDDs for bulk storage (media, backups, file shares). SSDs for cache, metadata, or all-flash pools where IOPS matter (VMs, databases, Docker volumes). A hybrid approach — HDD data pool with SSD cache — is the most cost-effective for most home and small-office NAS setups.
- Prioritise
- Cost per usable TB for your data pool. Random I/O performance for your application tier. Most NAS workloads are sequential and throughput-limited by the network, not the drives.
Prices updated hourly from Amazon US and UK. All links go directly to the retailer. Details.
Cheapest NAS HDDs per TB
NAS-rated hard drives offering the most storage per dollar — the default choice for bulk NAS capacity.
Cheapest SSDs for NAS Use per TB
SATA and NVMe SSDs for all-flash NAS builds, SSD cache, or metadata tiers.
High-Capacity NAS HDDs (12 TB+)
Large NAS drives for maximum density per bay — fewer drives, less power, simpler management.
How to Choose
Choosing between HDD and SSD for NAS depends on your workload, budget, and noise tolerance.
Cost per TB
HDDs cost $10–15/TB at high capacities. NAS-grade SSDs cost $50–80/TB. For bulk storage (media servers, backups, file shares), the HDD cost advantage is decisive. SSDs only make financial sense for high-IOPS workloads where you need the performance.
Noise and vibration
Spinning HDDs generate audible noise (25–35 dBA) and vibration, especially in multi-bay enclosures. SSDs are completely silent with zero vibration. If your NAS sits in your living space, this is a meaningful quality-of-life factor.
Power consumption
A typical NAS HDD draws 5–8W under load. A SATA SSD draws 2–3W. Over 4–8 drives running 24/7, the power difference adds up to $20–60/year in electricity. Not transformative, but worth noting for always-on setups.
Network bottleneck
A 1 GbE NAS maxes out at ~110 MB/s — even a single HDD can saturate this. 2.5 GbE (280 MB/s) is within HDD RAID capability. You need 10 GbE to benefit from SSD speeds in a NAS context. If your network is 1 GbE, SSDs offer no throughput advantage for file serving.
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