Two computed views of the NAS hard-drive market over time, both from our daily price history and maintained at [nasdisks.com](https://www.nasdisks.com/): what a terabyte costs, and how often drives actually go on sale. Scope throughout: in-production 8TB+ NAS hard drives, US, new in-stock prices, compiled from Amazon price history.
Monthly median price-per-terabyte, split into the two tiers people choose between: consumer NAS (WD Red / IronWolf class) and enterprise (Exos / MG / Ultrastar).
Median price-per-TB sat flat around \$20/TB through 2024 and most of 2025, then roughly doubled to the mid-\$40s/TB from late 2025, and has held there since. Both tiers moved together: among new drives, enterprise is not the price-per-TB bargain it's assumed to be, and both got hit about equally. The usual driver is the AI datacenter buildout pulling high-capacity nearline supply. Because the tiers track each other, there's no reliable price-per-TB win from picking enterprise over consumer among new drives; the one genuine discount is the recertified/refurbished enterprise market, which isn't included here.
**Method.** For each month, take each drive's average price-per-TB across its logged days, then the median of those per-drive values across drives (so a model with more logged days doesn't skew the month). 8TB and up because small drives carry a much higher price-per-TB, and which small SKUs happen to be in stock would swing an all-capacity median for reasons unrelated to prices actually moving.
**Interactive version** (hover, zoom, and a capacity-matched cheapest-per-TB table): [nasdisks.com/articles/nas-drive-price-crunch](https://www.nasdisks.com/articles/nas-drive-price-crunch/).
NAS drives (WD Red / IronWolf class, including the Pro lines) go on sale several times more often than enterprise/datacenter drives - roughly one day in ten vs one in forty - though the cut is about the same size when it happens (~10% typical, ~30% at the deepest). Seagate IronWolf Pro goes on sale most often; Exos and Ultrastar barely move. It's a difference in frequency, not depth.
**Method.** For each day we compare a drive's best price to a centred rolling median of its own recent price, so a genuine dip counts but the long price climb is not mistaken for a discount, then count the days sitting 5%+ below that baseline. A "sale event" is a run of such days.
- [`sale-frequency-weekly.csv`](sale-frequency-weekly.csv) - weekly share of tracked days on sale per tier: `week_start`, `consumer_pct_days_on_sale`, `enterprise_pct_days_on_sale`.
The figures here (monthly medians and sale-frequency aggregates) are free to use, with a credit to `nasdisks.com` (a link back is appreciated). They are computed aggregate statistics, provided as-is, and separate from the repository's CC BY 4.0 license, which covers the drive specs and CMR/SMR data.
