We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 3.5 inch SATA hard drive with circuit board visible

Western Digital

Western Digital WD400BD-75MRA2 40GB 7200RPM SATA 3.5 inch internal hard drive

SKU CH-EJNF-Z22A1

A 40 GB 3.5 inch desktop SATA hard drive spinning at 7200 RPM for internal storage

  • Flash memory typeSLC
  • 40 GB capacity stores essential files and applications
  • 7200 RPM spindle speed delivers responsive data access
  • SATA interface provides broad desktop compatibility
  • 5 inch form factor fits standard drive bays

Capacity and interface

The Western Digital WD400BD-75MRA2 is a 40GB 3.5 inch internal hard drive with a SATA connection. It suits desktop builders who need a small, low-cost volume for legacy operating systems or lightweight data storage.

Thermals noise and power

Spinning at 7200RPM, the drive produces modest heat and audible seek noise typical of mechanical disks. Power draw stays low enough for standard desktop power supplies without extra consideration.

How it compares

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

Price $24.99
Cheaper than about 93% of the 4,938 comparable items (median $107.99).

New to this? Paying with USDT: TRC-20 or ERC-20 — what to check, what it costs to pay, and what is never asked for.

Specifications

Storage
Flash memory typeSLC

Questions about this item

How do I install the WD400BD-75MRA2 3.5 inch SATA drive and which step is often missed?

Mount the drive in a 3.5 inch bay, connect the SATA data and power cables, then initialise and format the 40 GB volume in the operating system — the formatting step is frequently overlooked.

What maintenance or replacement will the WD400BD-75MRA2 40 GB 7200 RPM SATA drive need over time?

No routine maintenance is required; keep the system ventilated and run occasional SMART checks, and replace the drive if reallocated sectors appear or mechanical noise increases.

More in 3.5-Inch Internal Desktop HDDs

Similar items