Western Digital

Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ

Name: Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ
Brand: Western Digital
SKU: B087QTVCHH

Bottom line: The Western Digital 4TB WD Blue PC Internal Hard Drive HDD: 4TB capacity holds large game, ROM and media archives on one drive; main trade-off: 5400 RPM class is slower than 7200 RPM drives and any SSD.

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-21

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ 4TB capacity holds large game, ROM and media archives on one drive
✓ 256 MB cache helps with repeated reads and buffered writes
✓ SATA 6 Gb/s interface works with modern desktop motherboards
✓ Includes free Acronis True Image WD Edition for cloning and backup
✓ Standard 3.5-inch size fits common desktop and NAS-style bays

Cons

✗ 5400 RPM class is slower than 7200 RPM drives and any SSD
✗ 3.5-inch size won't fit laptops or 2.5-inch-only bays
✗ IDE-only retro PCs need a SATA controller or adapter to use it
✗ Old BIOSes and MBR-only operating systems can't address the full 4TB

Manufacturer description

The Western Digital WD Blue 4TB internal hard drive (model WD40EZAZ) gives your desktop or retro-build file server a lot of bulk storage in a standard 3.5-inch form factor. It connects over SATA 6 Gb/s, spins at 5400 RPM and has a 256 MB cache. That makes it a good fit for data that matters more for capacity than speed: game libraries, ROM and disk-image archives, media collections and backups. Four terabytes is enough room to keep your whole archive in one place instead of spread across several smaller drives. The lower spindle speed means the drive is meant for storage and everyday…

SpecPicks Verdict

SpecPicks scored Western Digital 4TB WD Blue PC Internal Hard Drive HDD using a rating × review-volume × price-fit model applied to published specs and reviews across the drives & media category. Western Digital's drives & media lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for drives & media of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

What are the key specs of the WD Blue WD40EZAZ?

It is a 4TB, 3.5-inch internal hard drive with a SATA 6 Gb/s interface, a 5400 RPM class spindle speed and a 256 MB cache.

Can I use this drive as my main boot drive?

It will work as a boot drive, but because it spins at 5400 RPM it is better as a secondary storage drive. For faster boot and load times, pair it with an SSD that holds your operating system.

Will it work in a laptop?

No. It is a 3.5-inch desktop drive, and laptops generally use 2.5-inch or M.2 storage. You need a desktop case or enclosure with a 3.5-inch bay.

Can I connect it to an older retro PC?

Only if the system has a SATA port or you add a SATA controller or adapter. Older BIOSes and operating systems that only support MBR partitioning may also not see all 4TB, because GPT is needed to address more than about 2.2TB.

Does it come with software to move data from my old drive?

Yes. Western Digital includes Acronis True Image WD Edition, which can clone an existing drive and create backups. Check the manufacturer's site for current warranty terms and the software download.

Key Features

Reliable everyday computing.Specific uses: Personal
Western Digital quality and reliability
Free Acronis True Image WD Edition cloning software
Massive capacity up to 6TB

Full Specifications

Size	4TB
Brand	Western Digital
Color	Blue
Model	WD40EZAZ
Warranty	2 years limited warranty
UnitCount	1
ReleaseDate	2021-02-01T00:00:01Z
Manufacturer	Western Digital Technologies, Inc.
ItemPartNumber	WD40EZAZ

Ready to buy?

Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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