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WD Ultrastar 12TB SAS HUH721212AL4200

HUH721212AL4200
Ultrastar HC520nearlineCMR12TBSAS-12G3.5"
$29.00/TB
$348.03
REFURBIn Stock
Price updated
Aug 4, 2026, 04:42 PM
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Quick Verdict

The WD Ultrastar 12TB SAS HUH721212AL4200 is a 12TB SAS-12G enterprise drive at $29.00/TB - CMR recording makes it safe for all RAID levels and NAS deployments. As a refurbished unit, run SMART diagnostics on arrival and verify power-on hours.

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Specifications

Capacity12TB
Form Factor3.5"
InterfaceSAS-12G
Recording TechCMR
RPM7200
Cache—
Sector Size4Kn
Workload Rating—
Warranty—
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90-Day Price History

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How it compares - 12TB SAS-12G
#1HP 12TB SAS 7.2K LFF Enterprise
$22.62/TB
#2WD Ultrastar 12TB SAS HUH721212AL5204
$28.25/TB
#3WD Ultrastar 12TB SAS HUH721212AL5200
$28.33/TB
#4WD Ultrastar 12TB SAS HUH721212AL4200THIS DRIVE
$29.00/TB
#5WD Ultrastar 12TB SAS HUH721212AL5205
$29.08/TB

Compare to similar 12TB SAS-12G drives

HP
12TB SAS 7.2K LFF Enterprise
$22.62/TB
$271.40
REFURB
WD
Ultrastar 12TB SAS HUH721212AL5204
$28.25/TB
$339.00
REFURB
WD
Ultrastar 12TB SAS HUH721212AL5200
$28.33/TB
$340.00
REFURB
WD
Ultrastar 12TB SAS HUH721212AL5205
$29.08/TB
$349.00
REFURB
HGST
12TB SAS 12G 7.2K
$35.18/TB
$422.17
REFURB

Frequently Asked Questions

Yes. The Ultrastar 12TB SAS HUH721212AL4200 uses CMR recording which is fully compatible with all RAID levels.

Warranty varies by seller. Check the Amazon listing for current warranty terms.

Compatible with any server or workstation equipped with a SAS HBA or SAS backplane. Tested with Dell PowerEdge, HPE ProLiant, Supermicro and IBM System x platforms.

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. Refurb units offer strong value for non-critical NAS.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
12TB SAS drives are ideal for backup targets. Dual-port SAS suits dual-path backup infrastructure.
🏗️
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. SAS dual-port suits HA cluster shared 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. Critical for refurb drives — refuse any with reallocated sectors > 0.
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: HBA not initialized, SAS expander issue, cable fault, or incompatible controller.
Fix: Verify HBA firmware. Check SAS topology with sas2ircu or StorCLI. Test with known-good cable. Confirm drive is SAS not SATA.