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data: add Exos X16 12TB/14TB; refresh export (142 drives, 15 with AFR)

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Re-exported drives.json/csv from the live API after the catalog import.
Softened README counts (140+) so they don't drift on future catalog changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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nettrust 2026-06-16 01:23:15 +02:00
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README.md
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# NAS drive dataset
An open dataset of NAS hard drives: full specs, **CMR vs SMR**, and real-world **Backblaze annualized failure rates (AFR)**. 138 drives, 13 with a measured failure rate. Our drive specs and CMR/SMR data are free to use - including commercially - under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) with credit; the Backblaze failure-rate fields stay under [Backblaze's own terms](#licence--attribution) (cite Backblaze; don't sell the data itself).
An open dataset of NAS hard drives: full specs, **CMR vs SMR**, and real-world **Backblaze annualized failure rates (AFR)**. 140+ drives, with a measured failure rate for the models Backblaze tracks. Our drive specs and CMR/SMR data are free to use - including commercially - under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) with credit; the Backblaze failure-rate fields stay under [Backblaze's own terms](#licence--attribution) (cite Backblaze; don't sell the data itself).
Maintained at [nasdisks.com](https://www.nasdisks.com), where the same data drives a live price comparison across seven Amazon regions.
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| File | Rows | What it is |
|------|------|------------|
| [`data/drives.csv`](data/drives.csv) | 138 | The headline file: one flat row per drive, specs joined to failure rate. |
| [`data/drives.json`](data/drives.json) | 138 | The same rows as JSON (mirror of the live API). |
| [`data/cmr-reference.csv`](data/cmr-reference.csv) | 138 | Source of truth for specs + CMR/SMR classification, with a per-row `confidence` flag. |
| [`data/drives.csv`](data/drives.csv) | 140+ | The headline file: one flat row per drive, specs joined to failure rate. |
| [`data/drives.json`](data/drives.json) | 140+ | The same rows as JSON (mirror of the live API). |
| [`data/cmr-reference.csv`](data/cmr-reference.csv) | 140+ | Source of truth for specs + CMR/SMR classification, with a per-row `confidence` flag. |
| [`data/backblaze-afr.csv`](data/backblaze-afr.csv) | 36 | Full-year 2025 Backblaze failure rates per model (the models Backblaze runs at scale). |
| [`data/series-reliability.csv`](data/series-reliability.csv) | - | Manufacturer series specs (warranty, rated workload, MTBF) used as context where Backblaze has no data. |
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## Methodology
- **CMR vs SMR** is classified from manufacturer datasheets and model-number decoding. SMR drives shingle their tracks, which cripples random-write and RAID-rebuild performance, so the distinction is the single most important spec for a NAS - and manufacturers do not always advertise it. The `confidence` column in `cmr-reference.csv` flags how certain each call is.
- **Failure rates** are computed from Backblaze's raw 2025 quarterly Drive Stats, aggregated to a full-year annualized rate and validated against Backblaze's own published fleet figure (~1.36% for 2025). Only the 13 catalog models that exactly match a Backblaze-tracked model carry an `afr_pct`; the rest are left null rather than guessed.
- **Failure rates** are computed from Backblaze's raw 2025 quarterly Drive Stats, aggregated to a full-year annualized rate and validated against Backblaze's own published fleet figure (~1.36% for 2025). Only the catalog models that exactly match a Backblaze-tracked model carry an `afr_pct`; the rest are left null rather than guessed.
- **`series-reliability.csv`** gives manufacturer-rated context (warranty years, workload TB/year, MTBF) for lines Backblaze doesn't run, so you have *something* to reason about beyond a blank cell.
## Licence & attribution