400-ATKO: Dell 900GB 15K RPM SAS 12Gb/s 512e 2.5in Hot-Plug Hard Drive
Also listed as: 04N31W, 4N31W, ST900MP0146, AL14SXB90EN · made by Seagate
The Dell 400-ATKO is a Dell 900GB 15K RPM SAS 12Gb/s 512e 2.5in Hot-Plug Hard Drive delivering 900GB of rotational storage at 15000 rpm over SAS 12Gb/s in a SFF 2.5in carrier. Manufactured by Seagate, the 400-ATKO provides dependable bulk storage for Dell R740, R640, R730, ME4024 enterprise servers.
Specifications
| Part number | 400-ATKO |
|---|---|
| Brand | Dell |
| Made by | Seagate |
| Type | Hard drives |
| Other numbers | 04N31W, 4N31W, ST900MP0146, AL14SXB90EN |
| Status | current |
| Capacity (GB) | 900 |
| Interface | SAS 12Gb/s |
| Form factor | SFF 2.5in |
| Speed | 15000 rpm |
| Endurance | Enterprise Mission Critical Workload |
About the 400-ATKO
The Dell 400-ATKO is a Dell 900GB 15K RPM SAS 12Gb/s 512e 2.5in Hot-Plug Hard Drive offering 900GB of rotational enterprise storage operating at 15000 rpm over SAS 12Gb/s in a SFF 2.5in format. Built with multi-platter mechanical assemblies from Seagate, the 400-ATKO provides dependable sequential throughput and 24/7 duty-cycle durability. In Dell's storage portfolio, 400-ATKO delivers economical storage capacity for secondary storage tiers, backup targets, and media streaming pools.
Compatibility
The 400-ATKO is compatible exclusively with 2.5-inch small form factor drive bays across Dell servers including R740, R640, R730, ME4024. The 400-ATKO mounts inside a DXD9H (14G–16G) hot-plug drive carrier and requires a SAS or SATA controller matching its SAS 12Gb/s specification. Part 400-ATKO cannot be installed into 3.5-inch drive bays without an approved mechanical adapter bracket.
How to identify a genuine unit
Genuine 400-ATKO units feature a Dell enterprise drive label displaying DP/N 04N31W, 900GB capacity, 15000 rpm rotational speed, and Seagate model markings ST900MP0146. In iDRAC under Physical Disks, the 400-ATKO registers with certified Dell firmware, active SMART diagnostics, and spindle temperature monitoring. The DXD9H (14G–16G) carrier for 400-ATKO includes status and activity indicator light pipes.
Buying used
When evaluating a pre-owned 400-ATKO, check SMART logs via OpenManage or smartctl to verify zero reallocated sectors (attribute 0x05) and zero pending defects (attribute 0xC5). Check power-on hours and execute an extended drive self-test on the 400-ATKO to verify smooth bearing rotation without head-parking noise. Ensure the correct DXD9H (14G–16G) caddy is supplied with the 400-ATKO.
Fits these models
Check compatibility with Dell
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Dell has tested with the Dell 400-ATKO.
- Compatibility Dell E-Lab Navigator (storage and SAN interoperability) (free vendor sign-in)
- Support Dell Support: drivers, manuals and service tag lookup
Equivalent part numbers
- Seagate ST900MP0146 Seagate Enterprise Performance 15K 900GB SAS HDD OEM base
Buying or selling 400-ATKO?
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Sources
- Dell 900GB 15K RPM SAS Hard Drive Specifications, checked 2026-10-27