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Silver rectangular 3.5-inch internal hard drive with exposed circuit board

Seagate

Seagate ST318406LW internal hard drive

SKU CH-ZDGV-CY721 MPN ST318406LW

A new desktop internal hard drive for legacy system storage or replacement

  • 5-year limited warranty included
  • Brand-new condition, never used
  • Designed for desktop internal installation
  • Seagate reliability for data storage
  • First listed by manufacturer April 30, 2026

18 GB enterprise hard drive

The Seagate ST318406LW is a 3.5-inch internal hard drive built for desktop workstations and entry-level servers that need reliable bulk storage. Its SCSI interface suits legacy platforms and specialised industrial systems where newer protocols are not supported. The drive ships new in retail or OEM packaging and carries a five-year limited warranty from the manufacturer.

Thermals noise and power

The unit runs at standard 3.5-inch desktop spindle speeds and draws power from a conventional Molex connector without auxiliary cables. Acoustic output stays within typical enterprise-class limits for rack or tower installations. No liquid cooling or active heatsinks are required for normal continuous operation.

Upgrade path and fit

This drive replaces failed or capacity-constrained SCSI disks in existing arrays, backup appliances or legacy workstations. The jump is worth it when the host controller cannot address larger LUNs or when firmware certification locks the system to this specific model. Buyers who need higher areal density or modern interfaces should look elsewhere.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $128.99
Pricier than about 55% of the 4,938 comparable items (median $107.99).

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Specifications

Product
Model namest318406lw
Size & build
Shipping weight0.91 kg
Package size152 × 102 × 51 mm

Questions about this item

How do I install the ST318406LW in a desktop, and what step is often missed?

Mount the drive in a 3.5-inch bay, connect the 68-pin SCSI cable and set the SCSI ID jumpers so no two devices share the same ID.

What maintenance or replacement will the ST318406LW need later?

The drive carries a five-year limited warranty; after that period plan to replace the unit if error rates rise or the motor becomes noisy.

What limit appears first during sustained use of the ST318406LW?

The SCSI bus bandwidth and the drive's internal media rate together cap the maximum sustained transfer speed.

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