3.84 TB enterprise 2.5-inch SATA SSD
Synology SAT5221-3840G 3.84 TB 2.5-inch SATA SSD
The Synology SAT5221-3840G is a 3.84 TB 2.5" 7mm SATA 6 Gb/s SSD for compatible Synology systems, with sustained sequential read performance up to 500 MB/s and an endurance rating of >7,000 TBW.
- Capacity
- 3.84 TB
- Interface
- SATA 6 Gb/s
- Random read
- 90,000 IOPS
- Endurance
- >7,000 TBW
Stable SATA performance for demanding Synology workloads
The Synology SAT5221-3840G is designed for mixed and intensive storage workloads where consistent SATA performance, endurance and Synology-system validation matter. It combines capacity-specific I/O ratings with power-loss protection and DSM-oriented drive management.
Capacity-specific throughput
Rated for sustained reads up to 500 MB/s and writes up to 500 MB/s.
Sustained random I/O
Rated up to 90,000 IOPS random read and 30,000 IOPS random write at 4 KB, QD32.
Enterprise-workload endurance
>7,000 TBW is specified using the JESD219A enterprise workload.
Power-loss protection
Protection is specified to help safeguard in-flight data during an unexpected power interruption.
DSM drive management
Synology integration supports workload-based lifetime analytics and streamlined firmware maintenance in validated deployments.
Five-year limited warranty
Coverage applies for five years or until the specified endurance is reached, whichever comes first.
Who is the Synology SAT5221-3840G best for?
A strong choice for
- Compatible Synology systems requiring a 3.84 TB enterprise SATA SSD
- Mixed and intensive 24/7 storage workloads
- Applications that benefit from stable sustained I/O
- Administrators wanting Synology-validated drive media
- Deployments that value DSM-based drive monitoring
Consider another model if you need
- The target Synology system does not list this exact model as compatible
- You need M.2 NVMe rather than a 2.5-inch SATA SSD
- You require a capacity other than 3.84 TB
- You need portable external storage
Key specifications
- Model
- SAT5221-3840G
- Capacity
- 3.84 TB
- Form factor
- 2.5" 7mm
- Interface
- SATA 6 Gb/s
- Sequential read
- 500 MB/s
- Sequential write
- 500 MB/s
- Random read
- 90,000 IOPS
- Random write
- 30,000 IOPS
- Endurance
- >7,000 TBW
- Warranty
- 5 years
Full technical specifications
Performance and endurance
| Model | SAT5221-3840G |
|---|---|
| Capacity | 3.84 TB |
| Form factor | 2.5" 7mm |
| Interface | SATA 6 Gb/s |
| Sustained sequential read (128 KB, QD32) | 500 MB/s |
| Sustained sequential write (128 KB, QD32) | 500 MB/s |
| Sustained random read (4 KB, QD32) | 90,000 IOPS |
| Sustained random write (4 KB, QD32) | 30,000 IOPS |
| Terabytes written (TBW) | >7,000 |
| Power-loss protection | Supported |
| Warranty | 5 years |
Power, environment and compatibility
| Active read (typical) | 4.5 W |
|---|---|
| Active write (typical) | 5 W |
| Idle | 1.2 W |
| Operating temperature | 0°C to 70°C (32°F to 158°F) |
| Storage temperature | -40°C to 85°C (-40°F to 185°F) |
| Compatibility | Check the current Synology compatibility list for the exact system and installation method before purchase |
Frequently asked questions about the Synology SAT5221-3840G
What is the Synology SAT5221-3840G?
It is a 3.84 TB 2.5" 7mm SATA 6 Gb/s SSD designed for compatible Synology systems.
What capacity does the SAT5221-3840G provide?
The SAT5221-3840G provides 3.84 TB of SSD capacity.
What form factor and interface does the SAT5221-3840G use?
It uses the 2.5" 7mm form factor and a SATA 6 Gb/s interface.
How fast is the SAT5221-3840G for sequential transfers?
It is rated for sustained sequential reads up to 500 MB/s and writes up to 500 MB/s.
What random performance does the SAT5221-3840G provide?
Synology rates it up to 90,000 IOPS random read and 30,000 IOPS random write at 4 KB, QD32.
What is the endurance rating of the SAT5221-3840G?
Synology specifies >7,000 TBW based on the JESD219A enterprise workload.
Does the SAT5221-3840G include power-loss protection?
Yes. Power-loss protection is specified for the SAT5221-3840G.
What operating temperature is specified for the SAT5221-3840G?
The specified operating range is 0°C to 70°C (32°F to 158°F).
What warranty applies to the SAT5221-3840G?
Synology specifies a five-year limited warranty, with coverage ending when the warranty period or stated drive endurance is reached, whichever comes first.
How do I confirm whether the SAT5221-3840G is compatible?
Check Synology's current compatibility list for the exact NAS, adapter or installation method before purchase.
- Performance figures are sustained single-drive results from Synology testing; actual results vary with host hardware, software and configuration.
- Endurance is based on the JESD219A enterprise workload.
- Confirm the exact Synology system, installation method and current compatibility status before purchase.
- Power consumption can vary by platform and configuration.
