Synology

Synology HAS5300 12TB SAS

HAS5300-12T
HAS5300CMR12TBSAS-12G3.5"
$55.83/TB
$669.99
NewIn Stock
Price updated
Price accurate as of Aug 19, 2026, 07:46 PM
Buy on Amazon โ†’
Before you buy: this is a SAS drive

SAS drives do not plug into a normal SATA motherboard port. You need a SAS host bus adapter or a backplane that speaks SAS - an LSI/Broadcom HBA in IT mode is the usual answer. A SATA drive will run on a SAS controller, but not the other way round. HBA and IT-mode guide

Same capacity, other options
DriveInterfaceCond$/TBPrice
WD Ultrastar 12TB SAS HUH721212AL5204SAS-12GRefurb$26.58$319.00Buy
WD Ultrastar 12TB SAS HUH721212AL5205SAS-12GRefurb$27.42$329.00Buy
MDD 12TB SATA 6G 7200RPM EnterpriseSATA-6GRefurb$27.50$329.95Buy
WD Ultrastar 12TB SAS HUH721212AL4200SAS-12GRefurb$27.74$332.89Buy

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

Model context

Part of the Synology line we track.

Quick Verdict

The Synology HAS5300 12TB SAS is a 12TB SAS-12G enterprise drive at $55.83/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"
InterfaceSAS-12G
Recording TechCMR
RPM7200
Cacheโ€”
Sector Sizeโ€”
Workload Ratingโ€”
Warranty5 years
ASINB09X741WQR
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 13% of them (34 of 264). The cheapest we can currently buy is $14.99/TB; the middle of the market is $37.80/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 โ†’Cheapest per terabyte, all categories โ†’Category price trends โ†’
How it compares - 12TB SAS-12G
#1WD Ultrastar 12TB SAS HUH721212AL5204
$26.58/TB
#2WD Ultrastar 12TB SAS HUH721212AL5205
$27.42/TB
#3WD Ultrastar 12TB SAS HUH721212AL4200
$27.74/TB
#4HGST 12TB SAS 12G 7.2K
$29.00/TB
#5HP 12TB SAS 7.2K LFF Enterprise
$30.00/TB

Frequently Asked Questions

Yes. The HAS5300 12TB SAS uses CMR recording which is fully compatible with all RAID levels.

5-year manufacturer warranty.

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

๐Ÿ 
Home & SMB NAS
Building a high-capacity NAS for media, backups and file sharing.
โœ“ Excellent fit
CMR recording is RAID-safe and fully compatible with Synology, QNAP, TrueNAS and UnRAID. New drives come with full warranty.
๐Ÿ’พ
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
โœ“ Excellent fit
12TB SAS drives are ideal for backup targets. Dual-port SAS suits dual-path backup infrastructure.
๐Ÿ—๏ธ
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. Establishes baseline for future comparison.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX โ€” takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX โ€” 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 Synology 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.