Seagate
Seagate Constellation ES ST500NM0021 500GB 7200 RPM 64MB SAS 6Gb/s 3.5" internal hard drive
A 500 GB 3.5 inch SAS drive spinning at 7200 RPM with 64 MB cache and 256-bit encryption for 24×7 enterprise workloads
- PackagingBare Drive
- InterfaceSAS 6Gb/s
- Capacity500GB
- RPM7200 RPM
- Cache64MB
- FeaturesEncryption
- Enterprise nearline drive built for 24×7 operation
- 6 Gb/s SAS interface delivers high-throughput connectivity
- 7200 RPM spindle speed supports fast sequential access
- 64 MB cache buffers bursts for smoother I/O
- Self-encrypting 256-bit option protects data at rest
Enterprise nearline drive
This Seagate Constellation ES model is a 500GB SAS hard drive built for 24×7 operation in enterprise storage arrays. It spins at 7200 RPM with a 64MB cache and includes self-encrypting drive technology. The 3.5-inch form factor fits standard server bays and it ships as a bare drive without accessories.
Suited for array rebuilds and cold tiers
The drive serves administrators who need a replacement SAS disk for existing nearline enclosures or a cost-effective tier for infrequently accessed data. Buyers who require larger capacities or faster interfaces for active workloads should evaluate other options. The bare-drive packaging also means no cables or mounting hardware are included in the box.
SAS 6Gb/s interface
The single specification that determines compatibility is the 6Gb/s SAS interface. Your backplane, HBA or RAID controller must support this exact protocol and speed for the drive to function. A system equipped only with different interfaces will not recognise the device.
Highlights
- Enterprise nearline drive built for 24×7 operation
- 6 Gb/s SAS interface delivers high-throughput connectivity
- 7200 RPM spindle speed supports fast sequential access
- 64 MB cache buffers bursts for smoother I/O
- Self-encrypting 256-bit option protects data at rest
Specifications
| Brand | Seagate |
|---|---|
| Series | Constellation ES |
| Model | ST500NM0021 |
| Packaging | Bare Drive |
| Interface | SAS 6Gb/s |
| Capacity | 500GB |
| RPM | 7200 RPM |
| Cache | 64MB |
| Features | Encryption |
| Form Factor | 3.5" |
| Shipping weight | 0.93 kg |
| Package size | 178 × 127 × 51 mm |
Questions about this item
How often should the 64MB cache drive be replaced in a 24×7 server?
The Constellation ES series is designed for continuous 24×7 operation with a 5-year limited warranty; replacement timing depends on workload and SMART monitoring.
What throughput limit appears first when the SAS 6Gb/s interface runs sustained writes?
The 7200 RPM mechanical speed and 64MB cache determine the sustained write ceiling before the 6Gb/s SAS link saturates.
How much heat and noise does the 3.5" 7200 RPM drive produce during all-day operation?
Enterprise nearline 7200 RPM drives run warmer and louder than desktop models; ensure adequate chassis airflow for 24×7 use.
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