Here is a pricing quirk that has baffled and delighted PC enthusiasts for years: an external hard drive often costs less than the bare internal drive inside it. A WD Elements 18TB external might sell for $250, while a comparable WD Red 18TB internal drive costs $350 or more.
The r/DataHoarder community on Reddit — over 900,000 members strong — has turned this pricing anomaly into an art form called "shucking." You buy the cheap external drive, pop open the case, and pull out the high-quality internal drive inside. It is the worst-kept secret in the storage world, and it is the single best way to get the lowest price per terabyte on hard drive storage.
Why Are External Drives Cheaper?
This seems backwards, right? An external drive has everything an internal drive has plus an enclosure, a power supply, and a USB controller. It should cost more. But it doesn't, for a few reasons:
Volume discounts. External drives sell in massive quantities to consumers, businesses, and even as gifts. Manufacturers negotiate better component pricing at higher volumes.
Market segmentation. Internal drives are sold to enthusiasts and IT professionals who are willing to pay a premium for specific features (NAS optimization, longer warranties, higher RPM). External drives compete on price in a commodity market.
Loss leaders. During sales events (Black Friday, Prime Day), external drives are often used as loss leaders to drive traffic. The discounts can be staggering — 30-40% off already-low prices.
The r/DataHoarder community tracks external drive prices obsessively. The magic number they look for is around $15/TB or lower. At that price point, shucking an external drive gives you enterprise-quality storage at consumer-grade pricing.
What Is Inside These External Drives?
This is the best part. External drives from WD and Seagate frequently contain the same high-quality drives sold under their premium internal brands:
WD Elements / My Book (8-20TB): Often contain WD Red Plus or WD Ultrastar (enterprise-grade) drives. These are helium-filled, CMR drives designed for 24/7 NAS operation. The exact model varies by production batch.
Seagate Expansion / Backup Plus (8-20TB): Usually contain Seagate Exos (enterprise) or Barracuda Pro drives. Again, helium-filled CMR drives rated for heavy workloads.
The drives inside are real, full-spec internal drives — not downgraded "external-only" versions. They have the same firmware, the same platters, and the same expected lifespan.
How to Shuck a Drive
The process is simple and takes about five minutes. No special tools required beyond a credit card or guitar pick.
Step 1: Identify the clips or tabs holding the enclosure together. Most WD and Seagate enclosures use plastic clips — no screws.
Step 2: Slide a thin plastic tool (credit card, guitar pick, or spudger) along the seam of the case and pop the clips one by one.
Step 3: Remove the drive from the enclosure. It is usually held in place by rubber bumpers or a few screws.
Step 4: Connect the bare drive to your motherboard using a SATA data cable and SATA power connector. Format and use like any other internal drive.
Shucking voids the external drive's warranty. You will not be able to get a warranty replacement from WD or Seagate if the drive fails after shucking. For most people, the price savings more than offset this risk, especially since you can buy a spare drive with the money you save.
The 3.3V Pin Issue
Some shucked WD drives use the SATA 3.3v pin for a reset function instead of power. If your power supply sends 3.3v on that pin (some modular PSUs do), the drive will not spin up.
The fix is simple: cover the third pin on the SATA power connector with a piece of Kapton tape. This blocks the 3.3v signal and the drive powers on normally. The r/DataHoarder community has documented this fix extensively, and it takes about 30 seconds.
Alternatively, use a Molex-to-SATA power adapter, which does not supply 3.3v at all.
WD vs Seagate for Shucking
Both brands are shuckable, but there are differences:
| Factor | WD Elements/My Book | Seagate Expansion |
|---|---|---|
| Drive inside | WD Red Plus / Ultrastar (varies) | Exos / Barracuda Pro (varies) |
| Ease of shucking | Easy — plastic clips | Easy — plastic clips |
| 3.3v pin issue | Yes (some models) | No |
| Warranty voided | Yes | Yes |
| Price per TB (typical) | $14-18/TB | $13-17/TB |
Seagate drives avoid the 3.3v pin hassle, which makes them slightly more convenient. WD drives sometimes contain enterprise Ultrastar drives, which are considered more reliable under heavy workloads. Both are excellent choices.
Best Capacities for Shucking
The sweet spot for price per TB shifts with sales, but generally:
- 14-18TB offers the best price per TB during sales events
- 20TB+ is available but the per-TB premium is higher
- 8-12TB is often only a good deal during deep discounts
Track external hard drive prices on BuyPerUnit to spot the best shucking opportunities. When the price per TB drops below $15, that is your signal.
Track External Hard Drive Prices Per GB →Is Shucking Worth It?
Here is a real example. During a recent sale:
- WD Elements 16TB external: $210 ($13.13/TB)
- WD Red Plus 16TB internal: $310 ($19.38/TB)
Shucking saves you $100 on the same drive. Buy four for a NAS and you save $400. That is enough to buy an additional drive for parity — giving you both more storage and better redundancy for the same total cost.
The only downside is the voided warranty. But hard drive failure rates are low (typically 1-2% annually for consumer drives), and the savings let you budget for a replacement drive if needed.
The Bottom Line
Shucking external hard drives is the single most effective strategy for getting the lowest price per terabyte on hard drive storage. The r/DataHoarder community has proven it over thousands of builds and petabytes of storage. If you are building a NAS, expanding your backup strategy, or just want the most storage for your money, check external drive prices before buying internal drives.
Compare All Hard Drive Prices by Cost Per GB →