MDD

MDD 20TB SATA 7200RPM NAS

MD20TS25672NAS
MDD EnterprisenearlineCMR20TBSATA-6G3.5"
$25.50/TB
$509.99
newIn Stock
Price updated
Price accurate as of Sep 15, 2026, 03:01 AM
Buy on Amazon →

The MDD 20TB SATA 7200RPM NAS is a 20TB SATA-6G HDD in new condition. It is in stock at $509.99 - $25.50/TB.

This drive is sold under the MDD (MaxDigitalData) label. Who is MDD? → — the trademark record, what the warranty covers, and the checks to run on arrival.

Same capacity, other options
DriveInterfaceCond$/TBPrice
MDD 20TB SATA 7200RPM NASSATA-6GRefurb$25.00$499.99Buy
WD Ultrastar 20TB SATASATA-6GRefurb$28.00$559.99Buy
WD Ultrastar 20TB SATA WUH722020ALE604SATA-6GRefurb$31.50$630.00Buy
WD Ultrastar 20TB SATA WUH722020ALE604SATA-6GRefurb$31.50$630.00Buy

All 20TB drives we track, ranked by cost per terabyte.

Model context

Part of the MDD line we track.

Quick Verdict

The MDD 20TB SATA 7200RPM NAS is a 20TB SATA-6G enterprise drive at $25.50/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

Capacity20TB
Form Factor3.5"
InterfaceSATA-6G
Recording TechCMR
RPM7200
Cache256MB
Sector Size512e
Workload Rating550TB/yr
Warranty5 years
ASINB0C3FBQNC9
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 90% of them (221 of 246). The cheapest we can currently buy is $14.99/TB; the middle of the market is $36.97/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 20TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 20TB SATA-6G
#1WD Ultrastar DC 20TB Renewed
$16.40/TB
#2WD Ultrastar DC HC570 20TB SATA
$23.50/TB
#3MDD 20TB SATA 7200RPM NAS
$25.00/TB
#4MDD 20TB SATA 7200RPM NASTHIS DRIVE
$25.50/TB
#5WD Ultrastar 20TB SATA
$28.00/TB

Works in these NAS machines

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

Frequently Asked Questions

Yes. The 20TB SATA 7200RPM NAS uses CMR recording which is fully compatible with all RAID levels. It is rated for 550TB/year workload.

5-year manufacturer warranty.

Compatible with any server, NAS or workstation with a SATA port. Works in Synology, QNAP, TrueNAS, UnRAID and all major NAS 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. New drives come with full warranty.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
20TB SATA drives are ideal for backup targets. SATA gives maximum $/TB for backup repositories.
☁️
Object Storage / Cold Data Tier
High-density storage for MinIO, Ceph or Hadoop at scale.
✓ Excellent fit
At 20TB per drive, a 60-bay JBOD delivers 1200TB raw — enough for petabyte-scale object storage.

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 10 hours for 20TB. 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 MDD 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 20TB 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.