18TB

WD Ultrastar DC HC550 18TB

Western Digital · MPN WUH721818ALE6L4

NAS-Safe· 85
Why this NAS-Safe score? (85/100 — Excellent for NAS)▾

The NAS-Safe Score rates suitability for 24×7 multi-bay NAS / RAID use on a 0–100 scale. It is additive and fully transparent — every point is attributable to a named factor below. High confidence — all inputs verified.

  • Recording technology35/35

    CMR — safe for RAID rebuilds

  • Vendor NAS endorsement0/15

    Not marketed as a NAS-class drive

  • Rotational-vibration sensors15/15

    Has RV sensors for multi-bay stability

  • Rated workload15/15

    550 TB/yr — enterprise/Pro tier

  • MTBF rating10/10

    2.5M hr — enterprise reliability

  • Warranty10/10

    5-year warranty

Sources

Specs

Capacity
18 TB
Class
ENTERPRISE
Recording
CMR
RPM
7,200
Cache
512 MB
Form factor
3.5"
Interface
SATA 6Gb/s
Warranty
5 years
Workload
550 TB/yr rated

Use-case fit

  • nas
  • cold archive
  • homelab

Live offers(2 retailers)

Price ratings compare a drive against its own price history and the other listings of that same drive — not against other drives. The $/TB badge is the cross-drive comparison. Neither is a compatibility or reliability recommendation.

  • eBay
    New
    Seller risk: low
    Excellent pricefor this drive· 83
    Why this DealScore? (83/100 — Excellent price for this drive)▾

    DealScore rates only whether the price is good right now (0–100), and only for this drive: it blends this listing's own price history with the other live listings of the same model. It is not a comparison against other drives — the $/TB badge does that — and use-case fit (NAS-Safe) and seller risk are scored separately.

    Price assessment only — not a compatibility or reliability recommendation.

    • Historical price positionn/a×60%

      insufficient history (<3 points)

    • Market price position83/100×40%

      3 comparable listings

    $30.50/TB — limited price history; beats 83% of comparable listings on $/TB.

    —
    $549.00
    $30.50/TB
  • eBay
    New
    Seller risk: low
    Average pricefor this drive· 50
    Why this DealScore? (50/100 — Average price for this drive)▾

    DealScore rates only whether the price is good right now (0–100), and only for this drive: it blends this listing's own price history with the other live listings of the same model. It is not a comparison against other drives — the $/TB badge does that — and use-case fit (NAS-Safe) and seller risk are scored separately.

    Price assessment only — not a compatibility or reliability recommendation.

    • Historical price position50/100×60%

      3 price points

    • Market price position50/100×40%

      3 comparable listings

    $36.11/TB — cheaper than 50% of its own price history; beats 50% of comparable listings on $/TB.

    +1 duplicate hidden ($679.25)
    Aug 14 · $650.00flat · 3 snapshots
    $650.00
    $36.11/TB

Prices snapshotted daily. See our scoring methodology.