Seagate Exos x12 12TB SATA 6Gb/s 256MB Cache Enterprise Hard Drive 3.5in (ST12000NM0127) (Renewed)
Bottom line: The Seagate Exos x12 12TB SATA 6Gb/s 256MB Cache Enterprise Hard Drive: 12TB enterprise capacity on a single 3.5in SATA 6Gb/s bay; main trade-off: renewed unit, not new, so it arrives with prior runtime.
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Pros & Cons
Pros
- ✓ 12TB enterprise capacity on a single 3.5in SATA 6Gb/s bay
- ✓ 7200RPM spindle with a 256MB cache buffer
- ✓ Rated by Seagate for continuous 24/7 operation
- ✓ SMART data left intact, so you can read power-on hours
- ✓ Exos X12 platform targets NAS, RAID, surveillance, and servers
Cons
- ✗ Renewed unit, not new, so it arrives with prior runtime
- ✗ Seller-listed brand is Amazon Renewed rather than Seagate direct
- ✗ 7200RPM enterprise spindles run louder than desktop NAS drives
- ✗ SATA 6Gb/s caps throughput well below any NVMe alternative
Manufacturer description
The Seagate Exos X12 is a 12TB enterprise-class 3.5-inch hard drive built for machines that never power down, and this Amazon Renewed unit puts that class of storage in reach at a fraction of new-drive pricing. Inside is the Enterprise Capacity v7 platform (model ST12000NM0127): 7200RPM spindle speed, a 256MB cache buffer, and a SATA 6Gb/s interface that drops straight into any standard 3.5-inch bay. Seagate rates the Exos line for continuous 24/7 duty cycles, which is why this drive shows up in NAS enclosures, RAID arrays, surveillance recorders, and rackmount servers rather than in…
SpecPicks Verdict
SpecPicks scored Seagate Exos x12 12TB SATA 6Gb/s 256MB Cache Enterprise Hard Drive… using a rating × review-volume × price-fit model applied to published specs and reviews across the PC & gaming hardware category. Amazon Renewed's PC & gaming hardware 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 PC & gaming hardware 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
Is this drive new or refurbished?
It is a renewed (refurbished) unit sold under the Amazon Renewed brand, not a factory-new drive. The listing states SMART data is intact and not reset, so you can check accumulated power-on hours yourself after installing it.
Will the Seagate Exos X12 work in my NAS?
It is a standard 3.5-inch SATA 6Gb/s drive built for NAS, RAID, surveillance, and server use, so it fits any enclosure with a 3.5-inch bay and a SATA connection. Confirm your NAS supports 12TB drives before ordering.
How fast is it?
The drive spins at 7200RPM with a 256MB cache buffer over a SATA 6Gb/s interface. That is enterprise-class mechanical performance, but it is a spinning platter, so sustained throughput is far below any SSD or NVMe drive.
What warranty comes with a renewed drive?
Renewed hardware is covered differently than factory-new Seagate stock, and terms vary by seller and program. Check the current product listing for the exact warranty and return window before you buy.
Key Features
- 12TB Capacity, Enterprise Capacity hard drive, designed for 24/7 operation
- 7200RPM Rotation Speed, 256MB Buffer Size, 3.5in Internal Hard Drive
- Perfect for NAS Network Storage, RAID Storage System, Surveillance System, Servers
- Designed for 24/7, Lower Power Consumption, Heavy Duty & Reliable
- SMART Data intact, not reset
Full Specifications
| Brand | Seagate |
|---|---|
| Color | Silver |
| Model Name | ST12000NM0127 |
| Unit Count | 1 Count |
| Form Factor | 3.5-inch |
| Media Speed | [approx] 200-300 MB/s |
| Model Number | ST12000NM0127 |
| Built-In Media | Hard Drive |
| Hard-Drive Size | 12 TB |
| Mfr Part Number | ST12000NM0127 |
| Number of Items | 1 |
| Special Feature | Enterprise-class hard drives are designed for higher performance and reliability. |
| Installation Type | Internal Hard Drive |
| Compatible Devices | Desktop |
| Data Transfer Rate | 6 gigabits_per_second |
| Enclosure Material | Metal (presumably) |
| Additional Features | Enterprise-class hard drives are designed for higher performance and reliability. |
| Hard Disk Interface | Serial ATA-600 |
| Warranty Description | 90 days limited warranty |
| Hard Disk Description | Mechanical Hard Disk |
Ready to buy?
Seagate Exos x12 12TB SATA 6Gb/s 256MB Cache Enterprise Hard Drive 3.5in (ST12000NM0127) (Renewed) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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