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WD Red Pro 12TB WD121KFBX

WD121KFBX
WD Red PronasCMR12TBSATA-6G3.5"
$56.20/TB
$674.45
newIn Stock
This offer: sold by Brute Networks Corporation · Amazon says New / Unknown
Price updated
Price accurate as of Nov 2, 2026, 08:49 PM
Buy on Amazon

The WD Red Pro 12TB WD121KFBX is a 12TB SATA-6G HDD in new condition. It is in stock at $674.45 - $56.20/TB.

Where this listing sits: every 12TB hard drive · 12TB SATA drives · WD 12TB SATA — each page is the live ranking for that slice of the catalogue.

Same capacity, other options
DriveInterfaceCond$/TBPrice
HP 12TB SAS 7.2K LFF EnterpriseSAS-12GRefurb$30.00$359.99Buy on Amazon
WD Ultrastar 12TB SATA HUH721212ALE604SATA-6GRefurb$30.00$359.99Buy on Amazon
MDD 12TB SATA 6G 7200RPM 256MB NASSATA-6GRefurb$30.00$359.99Buy on Amazon
WD Ultrastar 12TB SAS HUH721212AL4200SAS-12GRefurb$31.96$383.55Buy on Amazon

All 12TB drives we track, ranked by cost per terabyte.

Model context

CMRSource: WD Red Pro NAS HDD data sheet Recording technology for this model

Part of the WD line we track.

Quick Verdict

The WD Red Pro 12TB WD121KFBX is a 12TB SATA-6G enterprise drive at $56.20/TB - CMR recording makes it safe for all RAID levels and NAS deployments. New unit with full 5-year warranty.

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Specifications

Capacity12TB
Form Factor3.5"
InterfaceSATA-6G
Recording TechCMRsource
RPM7200
Cache256MB
Sector Size—
Workload Rating550TB/yr
Warranty5 years
ASINB07RTMPWD8
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 62% of them (150 of 243). The cheapest we can currently buy is $14.99/TB; the middle of the market is $38.33/TB.

Where the wider market has moved

These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.

Compare against every 12TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 12TB SATA-6G
#1WD Ultrastar 12TB SATA HUH721212ALE604
$30.00/TB
#2MDD 12TB SATA 6G 7200RPM 256MB NAS
$30.00/TB
#3WD Red Pro 12TB WD121KFBXTHIS DRIVE
$33.33/TB
#4WD Gold 12TB
$35.00/TB
#5WD Purple 12TB WD121PURZ
$38.33/TB

Works in these NAS machines

TerraMaster (32 machines)
Vendor-listed
On TerraMaster's list - Recommended
Asustor (13 NAS series)
Vendor-listed
On Asustor's list as Red Pro WD121KFBX
UniFi UNAS / UNVR
Fit-verified
Meets Ubiquiti's written 1TB+ CMR requirement; check the 7200RPM clause

Resolved against manufacturer compatibility lists we read and dated, capped at 4. Vendor-listed means the manufacturer names this exact part number; fit-verified is our own check of form factor, interface and recording technology against a published requirement. Neither is a guess, and a drive the registry cannot resolve shows nothing here rather than a maybe. How compatibility actually works

Also appears in

Other pages
SATA hard drives
Price per terabyte
CMR or SMR
NAS hard drives
Recertified
By workload
Hard drives by capacity

Frequently Asked Questions

Yes. At our last check it was $674.45 ($56.20 per terabyte at its 12TB capacity), sold new under ASIN B07RTMPWD8. Amazon sets the final price at checkout.

This listing (WD121KFBX, ASIN B07RTMPWD8) carries no renewed, recertified, refurbished or pulled claim in its title, and Amazon reports it as new. On this site that is what "new" means: sold as factory-new. The stored warranty on this row is 5 years, as the listing states it.

The WD121KFBX's stored recording technology is CMR (manufacturer-sourced), which rebuilds predictably in RAID. The row carries a 550TB/year workload rating.

Use Case Scenarios

🏠
Home & SMB NAS
Building a high-capacity NAS for media, backups and file sharing.
✓ Excellent fit
CMR recording is RAID-safe and fully compatible with Synology, QNAP, TrueNAS and UnRAID. New drives come with full warranty.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
12TB SATA drives are ideal for backup targets. SATA gives maximum $/TB for backup repositories.
🏗️
Virtualization Host Storage
VM images and snapshots on Proxmox, VMware or Hyper-V.
~ Good fit
Suitable for VM storage where workloads are not IOPS-intensive. SATA is fine for single-host VM storage. Consider NVMe cache for latency-sensitive VMs.

Maintenance & Troubleshooting

Maintenance Checklist

On installCheck SMART baseline on arrival
Run smartctl -a /dev/sdX and record: Reallocated_Sector_Ct, Power_On_Hours, Spin_Retry_Count. Establishes baseline for future comparison.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX — takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX — full surface scan, takes 6 hours for 12TB. Any test failure is grounds for immediate replacement.
QuarterlyCheck RAID array health
Verify no degraded drives. A degraded array with no hot spare is one failure from data loss. Check mdstat or controller UI.
AnnuallyVerify drive firmware version
Check WD support site for firmware updates. Some versions have known bugs affecting integrity.
Every 3-5 yearsPlan proactive replacement
Enterprise HDDs have higher failure rates after year 4-5. At 12TB per drive, budget for replacements before failures occur.

Troubleshooting Guide

Cause: Loose SATA data or power cable, failed port, or drive not spinning up.
Fix: Reseat both cables. Try a different port. Listen for spin-up sound. Test with a known-good cable.