EOL transition guide · Published
Micron 9400 to 9550 SSD transition guide
FAE perspective, drive comparisons and part-number cross-references for evaluating a Micron 9550 in an existing 9400 design.
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The Micron 9400 to 9550 transition moves from PCIe Gen4 to Gen5. Compare the drive configurations and check the server requirements before qualifying a replacement.
Updated September 11, 2026.
What changes between the families
| Feature | Micron 9400 | Micron 9550 |
|---|---|---|
| Interface | PCIe Gen4 x4 | PCIe Gen5 x4 |
| Form factors | 2.5-inch U.3/U.2, 15mm | U.2, E1.S and E3.S |
| PRO capacities | 7.68TB, 15.36TB, 30.72TB | 3.84TB, 7.68TB, 15.36TB, 30.72TB |
| MAX capacities | 6.4TB, 12.8TB, 25.6TB | 3.2TB, 6.4TB, 12.8TB, 25.6TB |
| Sequential read, up to | 7,000 MB/s | 14,000 MB/s |
| Sequential write, up to | 7,000 MB/s | 10,000 MB/s |
These are family-level specifications; not every capacity is offered in every form factor. Performance depends on the exact model, host and workload. See Micron’s 9400 technical specification and 9550 technical specification for the test conditions and configuration details.
FAE perspective
Asked what changed from the 9400 to the 9550, Keith Peterson described the interface transition in Edge’s original January 2025 guide:
A night and day difference. The new Micron 9550 utilizes the new PCIe Gen 5 interface with performance metrics that nearly double those of the PCIe Gen 4 versions of the previous generation.
That was the central engineering point of the original discussion. The comparison above shows the published read and write limits separately; a particular application’s gain depends on its platform and workload.
The original FAQ also covered management, security and data protection. The 9550 technical specification lists NVMe 2.0b, NVMe-MI 1.2c, OCP 2.0 support with OCP 2.5 telemetry features, signed firmware, firmware activation without reset, and enterprise power-loss and data-path protection. Confirm encryption, firmware and any TAA or other sourcing requirements against the complete proposed part number and current manufacturer documentation.
Historical EOL dates
Edge’s January 2025 transition notice recorded these 9400 dates:
- Last order date: June 11, 2025
- Last ship date: December 11, 2025
These are past ordering milestones. Ask Edge about current supply and qualification options for an active program.
9400 to 9550 part-number cross-references
The table preserves the configurations identified in Edge’s original transition guide. Each listed 9550 candidate is a U.2, Non-SED configuration. Review the full predecessor and successor part numbers, security requirements, firmware and host qualification together; this table does not establish a drop-in replacement for every system.
| 9550 Form Factor | Capacity | 9400 Part Number | 9550 Candidate |
|---|---|---|---|
| U.2 | 12.8TB | MTFDKCC12T8TGJ-1BC1ZABDB | MTFDLAL12T8THB-1BK1JABYY |
| U.2 | 12.8TB | MTFDKCC12T8TGJ-1BC1ZABYY | MTFDLAL12T8THB-1BK1JABYY |
| U.2 | 15.36TB | MTFDKCC15T3TGH-1BC1ZABAA | MTFDLAL15T3THA-1BK1JABYY |
| U.2 | 15.36TB | MTFDKCC15T3TGH-1BC1ZABDB | MTFDLAL15T3THA-1BK1JABYY |
| U.2 | 15.36TB | MTFDKCC15T3TGH-1BC1ZABYY | MTFDLAL15T3THA-1BK1JABYY |
| U.2 | 25.6TB | MTFDKCC25T6TGJ-1BC1ZABDB | MTFDLAL25T6THB-1BK1JABYY |
| U.2 | 25.6TB | MTFDKCC25T6TGJ-1BC1ZABYY | MTFDLAL25T6THB-1BK1JABYY |
| U.2 | 30.72TB | MTFDKCC30T7TGH-1BC1ZABAA | MTFDLAL30T7THA-1BK1JABYY |
| U.2 | 30.72TB | MTFDKCC30T7TGH-1BC1ZABDB | MTFDLAL30T7THA-1BK1JABYY |
| U.2 | 30.72TB | MTFDKCC30T7TGH-1BC1ZABYY | MTFDLAL30T7THA-1BK1JABYY |
| U.2 | 6.4TB | MTFDKCC6T4TGJ-1BC1ZABDB | MTFDLAL6T4THB-1BK1JABYY |
| U.2 | 7.68TB | MTFDKCC7T6TGH-1BC1ZABAA | MTFDLAL7T6THA-1BK1JABYY |
| U.2 | 7.68TB | MTFDKCC7T6TGH-1BC1ZABDB | MTFDLAL7T6THA-1BK1JABYY |
| U.2 | 7.68TB | MTFDKCC7T6TGH-1BC1ZABYY | MTFDLAL7T6THA-1BK1JABYY |
Host qualification and workload
Check the server or platform’s supported drive configuration, backplane, power, cooling and firmware. The 9550’s E1.S and E3.S options support other platform designs; they are not mechanically interchangeable with a 2.5-inch drive bay.
The original 9550 upgrade article highlighted AI workloads and power efficiency. Micron’s launch announcement provides those benchmark comparisons and their conditions. Use the results relevant to your workload when evaluating a change, alongside capacity and required write endurance.
Send us the 9400 part number, server or platform details and production timing. Discuss the transition with Edge so we can review candidate drives and the qualification and supply plan.