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price-trends README: prominent links up top; fix $/TB math-render in Files

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Move the interactive-article + nasdisks links into a bold callout above the
chart (were blending into the image / stuck at the very end). Reword the Files
line to column names so GitHub stops parsing the two $ signs as LaTeX math.
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price-trends/README.md
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Monthly median price-per-terabyte for current 8TB+ NAS hard drives (US, new, in stock), from Jul 2024 to the latest month, split into the two tiers people choose between: consumer NAS (WD Red / IronWolf class) and enterprise (Exos / MG / Ultrastar).
Part of the open [NAS drive dataset](https://github.com/deeddy/nas-drive-data), maintained at [nasdisks.com](https://www.nasdisks.com/).
> **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/)**
>
> Part of the open [NAS drive dataset](https://github.com/deeddy/nas-drive-data), maintained at **[nasdisks.com](https://www.nasdisks.com/)**.
![Median $/TB, consumer NAS vs enterprise](nas-price-trend.png)
![Median dollars per TB, consumer NAS vs enterprise](nas-price-trend.png)
## The trend
Median $/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 $/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.
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.
## Files
- [`monthly-median-per-tb.csv`](monthly-median-per-tb.csv) - month, consumer median $/TB, enterprise median $/TB. Computed monthly medians only.
- [`monthly-median-per-tb.csv`](monthly-median-per-tb.csv) - columns: `month`, `consumer_usd_per_tb`, `enterprise_usd_per_tb`. Computed monthly medians only.
## Method
For each month, take each drive's average $/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). Scope: 8TB and up, US, new in-stock prices, compiled from Amazon price history. CMR/SMR and specs from datasheets.
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). Scope: 8TB and up, US, new in-stock prices, compiled from Amazon price history. CMR/SMR and specs from datasheets.
8TB and up because small drives carry a much higher $/TB (fixed per-drive costs spread over less capacity), and which small SKUs happen to be in stock would swing an all-capacity median for reasons unrelated to prices actually moving.
8TB and up because small drives carry a much higher price-per-TB (fixed per-drive costs spread over less capacity), and which small SKUs happen to be in stock would swing an all-capacity median for reasons unrelated to prices actually moving.
This folder publishes the computed monthly medians only, not the underlying per-drive price observations.
## Interactive version
The live, interactive version (hover, zoom, a capacity-matched cheapest-$/TB table, and the full write-up) is at [nasdisks.com/articles/nas-drive-price-crunch](https://www.nasdisks.com/articles/nas-drive-price-crunch/).