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vault backup: 2026-03-29 12:04:20

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Yanxin Lu
2026-03-29 12:04:20 -07:00
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notes/Unraid Drive Replacement Plan.md
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Total data stored: ~25TB, growing ~1TB/year
## Drive Buyer's Guide
Only 3 manufacturers make 3.5" HDDs: Seagate, WD, and Toshiba. All others (Samsung, Hitachi, HGST, Maxtor) were acquired.
| Brand | Line | Tier | CMR | RPM | Workload | MTBF | Warranty | ~16TB Price |
|---|---|---|---|---|---|---|---|---|
| **Seagate** | BarraCuda | Consumer | **SMR** | 5400 | — | — | 2 yr | ~$250 |
| | IronWolf | Home NAS | CMR | 7200 | 180 TB/yr | 1M hrs | 3 yr | ~$210 |
| | IronWolf Pro | Pro NAS | CMR | 7200 | 300 TB/yr | 1.2M hrs | 5 yr | ~$230 |
| | Exos (X18/X20/X24) | Enterprise | CMR | 7200 | 550 TB/yr | 2.5M hrs | 5 yr | ~$220 |
| **WD** | Red | Light NAS | **SMR** | 5400 | 180 TB/yr | 1M hrs | 3 yr | ~$210 |
| | Red Plus | Home NAS | CMR | 5400-7200 | 180 TB/yr | 1M hrs | 3 yr | ~$210 |
| | Red Pro | Pro NAS | CMR | 7200 | 300 TB/yr | 1M hrs | 5 yr | ~$230 |
| | Ultrastar | Enterprise | CMR | 7200 | 550 TB/yr | 2.5M hrs | 5 yr | ~$220 |
| **Toshiba** | N300 | Home NAS | CMR | 7200 | 180 TB/yr | 1M hrs | 3 yr | ~$200 |
| | MG Series | Enterprise | CMR | 7200 | 550 TB/yr | 2.5M hrs | 5 yr | ~$210 |
**Avoid SMR drives** (BarraCuda, WD Red no suffix) — terrible for Unraid parity rebuilds. Home NAS tier (CMR) is perfectly adequate; enterprise is worth it when the price gap is small (<$15/drive). Best deals typically appear during Black Friday / Cyber Monday (20-40% off).
## Shopping List
| Drive | Model | Purpose | Est. Price |