Seagate
Seagate Cheetah NS ST3400755SSProduct 400 GB 3.5" SAS internal hard drive
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$23.99
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HPE
HPE P18420-B21 240GB SATA 2.5" enterprise SSD
2.5-inch SATA enterprise SSD with 240GB capacity, 69,500 read IOPS and 14,000 write IOPS at .8 DWPD endurance
- Form Factor2.5"
- Capacity240GB
- InterfaceSATA III
- 4KB Random ReadUp to 69,500 IOPS
- 4KB Random WriteUp to 14,000 IOPS
- Endurance0.8 DWPD
- Low-latency reads with up to 69,500 4KB random read IOPS
- Consistent write performance reaching 14,000 4KB random write IOPS
- Fits standard 2.5-inch SATA bays with 7.00mm height
- Read-intensive endurance rated at 0.8 DWPD for mixed workloads
- Efficient 4W active power draw reduces server thermal load
Enterprise SATA SSD for read-intensive workloads
The HPE P18420-B21 is a 2.5-inch solid-state drive built for server environments that prioritise consistent read performance. Its 240GB capacity suits boot volumes, caching tiers or logging arrays where write demands stay moderate. The SATA III interface ensures broad compatibility with existing drive bays and controllers. This new drive targets administrators who need reliable endurance without the cost of mixed-use or write-intensive media.
Low active power and silent operation
With an active power draw of 4W, the drive adds minimal thermal load to a populated chassis. The 7.00mm height fits standard SFF bays without requiring additional spacing or airflow planning. No moving parts means zero acoustic output during normal operation. These characteristics simplify cooling design in dense 2.5" deployments where many drives share a backplane.
Steady random performance under sustained load
The drive delivers up to 69,500 4KB random read IOPS and 14,000 4KB random write IOPS when workloads remain continuous. Endurance is rated at .8 DWPD, so write-heavy bursts must stay within that daily budget to avoid premature wear. Performance remains stable as long as the queue depth and temperature stay within enterprise specifications. Workloads exceeding the write endurance should consider a higher DWPD model.
Highlights
- Low-latency reads with up to 69,500 4KB random read IOPS
- Consistent write performance reaching 14,000 4KB random write IOPS
- Fits standard 2.5-inch SATA bays with 7.00mm height
- Read-intensive endurance rated at 0.8 DWPD for mixed workloads
- Efficient 4W active power draw reduces server thermal load
Specifications
| Brand | HPE |
|---|---|
| Model | P18420-B21 |
| Form Factor | 2.5" |
| Capacity | 240GB |
| Interface | SATA III |
| 4KB Random Read | Up to 69,500 IOPS |
| 4KB Random Write | Up to 14,000 IOPS |
| Endurance | 0.8 DWPD |
| Features | 240GB SATA RI SFF SC MV SSD |
| Power Consumption (Active) | 4W |
| Height | 7.00mm |
| Shipping weight | 0.45 kg |
| Package size | 229 × 178 × 127 mm |
Questions about this item
How do I install the 2.5" SATA III drive and what step is often missed?
Mount the 7.00mm 2.5" drive in a SFF bay, connect the SATA data and power cables, then enable AHCI in the server BIOS so the OS recognises the 240GB volume.
What maintenance or replacement will the 240GB SATA RI SSD need over its life?
The drive is rated at 0.8 DWPD; plan to replace it once the SMART wear indicator reaches the rated endurance threshold for the 240GB capacity.
Which limit appears first on the P18420-B21 during sustained heavy writes?
The 14,000 IOPS random write ceiling is reached before the 4W active power envelope becomes a constraint.
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