Compare
Used enterprise drive vs new NAS drive
In our November 2026 example a used 16 TB enterprise drive costs $15.10 per TB over five years, power included, against $24.34 for a new 12 TB NAS drive. Workload ratings are 550 TB/year against 180 TB/year. The new drive has the longer warranty: 3 to 5 years against up to 2 on our certified tiers.
Updated Nov 3, 2026
Side by side
| Specification | Used enterprise drive | New NAS drive |
|---|---|---|
| Example drive | Exos X16 16TB, Light Use tier | IronWolf 12TB, new |
| Example price (Nov 2026) | $189.00 | $250.00 |
| Purchase cost per TB | $11.81 | $20.83 |
| Average power draw (assumed) | 7.5 W | 6 W |
| 5-year electricity at $0.16/kWh | $52.56 | $42.05 |
| 5-year cost per TB | $15.10 | $24.34 |
| Workload rating | 550 TB/year | 180 TB/year (IronWolf, WD Red Plus class) |
| Warranty | 90 days on standard items, up to 2 years on certified usage tiers; term stated on each listing | 3 to 5 years from the manufacturer, by product line |
| Hours at purchase | Read from the drive and disclosed per unit; Light Use is under 20,000 h | Zero |
| Helium fill | Yes on the Exos X and Ultrastar DC HC500 lines | Varies by model and capacity |
| Error recovery control | Yes (SCT ERC) | Yes on NAS lines (TLER / ERC) |
| Spindle speed | 7200 rpm | 5400 to 7200 rpm, by model |
| Noise and power | Audible seeks; a watt or two more at idle | Quieter, especially 5400-class models |
| Per-unit test report | Yes: SMART, extended self-test, fio benchmark, sanitize record | No; sold factory-sealed |
- Prices are examples as of November 2026, not quotes. Live prices are on each product page.
- Both drives run 24 hours a day for 5 years (43,800 hours) at $0.16 per kWh. Average draw is assumed; enterprise drives idle around 5 W and draw 9 to 10 W under random load.
- No replacement drive is included in either column. If you keep a spare, add its price to both.
- Cost per TB uses raw capacity. For usable capacity after RAID or RAIDZ parity, use the calculator.
Which to pick
Bulk storage, media libraries and backups
Used enterprise drive
Lowest cost per terabyte, and the workload rating covers heavy scrubs and rebuilds.
A NAS in a quiet room or on a desk
New NAS drive, 5400-class
Lower seek noise and slightly lower power matter more there than cost per terabyte.
You want the longest warranty
New NAS drive, Pro line
Up to 5 years of manufacturer coverage, against up to 2 years on our certified tiers.
You want to see the drive's history first
Used enterprise drive, certified tier
Every certified unit has a public report with its power-on hours, SMART results and extended self-test.
Our test data and stock
Every unit of these models we have tested in-house, from our test database, and what is listed today.
Exos X16 16TB SAS (enterprise)
ST16000NM002G
1 in stock from $398.96
- Units tested
- 16
- Passed
- 16
- Median hours
- 27,178 h
- Price
- $398.96 to $446.46
Ultrastar DC HC550 18TB SAS (enterprise)
WUH721818AL4200
14 in stock from $465.46
- Units tested
- 19
- Passed
- 19
- Median hours
- 12,784 h
- Price
- $465.46
IronWolf 12TB (NAS drive, sold used)
ST12000VN0008
Currently sold out, 4 units tested since Sep 2026
- Units tested
- 4
- Passed
- 2
- Median hours
- 10,740 h
Common questions
Why is the used enterprise drive cheaper per terabyte?+
Datacenter pulls reach the market in volume when servers are refreshed. The drive has hours on it, which we disclose through its usage tier, but its workload rating is about three times that of a standard NAS drive.
Does the NAS drive’s lower power draw close the gap?+
Not at these prices. A 1.5 W difference over five years costs about $10.51 per drive at $0.16 per kWh, small next to the difference in purchase price.
What does the workload rating mean?+
It is the amount of data the manufacturer expects the drive to read and write per year within its rated use. 550 TB/year is the enterprise capacity standard; 180 TB/year is typical for standard NAS drives.
How do I run the numbers for my own array?+
Use the calculator: enter the drive count, capacity, RAID or ZFS layout and price per drive, and it returns cost per usable TB.