DatacenterDisk

HGST Ultrastar vs Seagate Constellation

Side-by-side spec and price comparison. Live data from Amazon US.

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Our Recommendation
👑
Seagate Constellation ES.2 3TB SAS Enterprise

Seagate Constellation ES.2 3TB SAS Enterprise balances price ($29.45/TB), warranty (— years), and 550TB/yr workload rating for the best overall value.

Best $/TB: HGST
Best Warranty: Seagate
Best for RAID: Seagate
Full Specification Comparison
Spec
HGST
Ultrastar HUS723030ALS640 3TB SAS 6G
$17.67/TB
Seagate
Constellation ES.2 3TB SAS Enterprise
$29.45/TB
Brand
HGST
Seagate
Model
Ultrastar HUS723030ALS640 3TB SAS 6G
Constellation ES.2 3TB SAS Enterprise
Series
Ultrastar
Constellation
Part Number
HUS723030ALS640
ST33000650SS
$/TB
👑$17.67
$29.45
Price
$53.00
$88.35
Condition
Refurb
New
Capacity
3TB
3TB
Interface
SAS-6G
SAS-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
CMR
CMR
RPM
7,200
7,200
Cache
—
—
Sector Size
512n
512n
Workload Rating
—
550TB/yr
DWPD
N/A
N/A
Warranty
—
—
Workload Tier
nearline
nearline
In Stock
Check
✓ In Stock
Buy
Buy on Amazon →
Buy on Amazon →
Workload Fit
Workload
HGST
Seagate
NAS Storage
●●
●●
Backup Target
●●●
●●●
OLTP Database
●
●
Cold Archive
●
●
Virtualization
●
●
AI/ML Storage
●
●
Buying Recommendation
Choose HGST Ultrastar HUS723030ALS640 3TB SAS 6G if:
  • ✓ You need maximum storage per dollar
  • ✓ You're comfortable with datacenter refurb to maximize savings
Buy HGST →
Choose Seagate Constellation ES.2 3TB SAS Enterprise if:
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ Your server runs 24/7 under heavy sustained load
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Seagate →

Frequently Asked Questions

HGST Ultrastar offers better value at $17.67/TB vs $29.45/TB - a 40% price difference. Factor in warranty length and workload rating when the price gap is small.

Mixing drives of different models in RAID is not recommended even if capacities match. Different firmware, error handling and seek patterns can cause rebuild issues. Use identical drives within the same RAID group for reliable operation.

Both drives carry similar warranty terms and are built for enterprise operation. Check brand-specific AFR data and Backblaze drive stats for real-world failure rate comparisons.

HGST Ultrastar is the better fit for NAS storage. It uses CMR recording which is safe for all RAID levels. SAS interface requires a SAS HBA or SAS-capable NAS.

HGST Ultrastar vs Seagate Constellation - Comparison | Datacenter