Overview
Micron 7450 NVMe SSDs are affected by two distinct firmware issues, and at present there is no single firmware version that is free of both. Drives on firmware E2MU200 can enter a panic state that renders the drive and its data permanently inaccessible. Micron's fix for the panic issue is firmware E2MU300. However, E2MU300 has a separate, documented problem: a 7450 can report a PFA (predictive failure) error following an AC or DC power cycle, and there have been field reports of affected drives becoming unusable. A newer firmware that addresses both is expected but has not yet been released. Until it ships, the correct action depends on your environment, and power cycles should be minimized on affected drives.
(The related 7500 panic issue applies to firmware E3MQ000.)
Affected Products
Micron 7450 NVMe SSDs (and 7500, for the panic issue only).
- Panic state: firmware E2MU200 (7450), E3MQ000 (7500)
- Power-cycle PFA issue: firmware E2MU300 (7450)
Issue 1: Panic State (E2MU200)
- Sudden panic state where the drive stops responding.
- I/O operations fail completely.
- Data becomes inaccessible with no recovery path.
- Once panic occurs, firmware cannot be updated, and the drive is permanently unusable.
Issue 2: PFA Error After Power Cycle (E2MU300)
- After upgrading to E2MU300, a 7450 may report a PFA (predictive failure) error following an AC or DC power cycle.
- Field reports include drives becoming unusable or requiring replacement after a power cycle, so this should be treated as a real risk, not a benign warning.
- Documented by Lenovo (advisory TT3600, "Micron 7450 may report PFA error after DC or AC cycle") and independently corroborated in community reports. A newer generic firmware to address this is expected but not yet published.
Verifying Firmware Version
If you are running Micron 7450 or 7500 NVMe SSDs in your system, you can check the current firmware version using standard NVMe utilities.
# sudo nvme listExample output:
Node SN Model Namespace FW Rev
---------------- -------------------- ---------------------- --------- --------
/dev/nvme0n1 123456789ABCDEF Micron_7450_PRO 1 E2MU200
Resolution / Recommended Action
- E2MU300 remains the only firmware that fixes the E2MU200 panic, so drives still on E2MU200 remain exposed to the panic bug and E2MU300 is the available remedy for that specific issue.
- Because E2MU300 carries its own power-cycle risk and no fully clean firmware is yet available, weigh which risk applies to your deployment before flashing. Systems that are rarely power-cycled and currently on E2MU200 are most exposed to the panic bug, and upgrading reduces that exposure. Systems that are power-cycled regularly may face greater risk on E2MU300 than on E2MU200.
- In all cases, minimize unnecessary power cycles on affected 7450 drives until a firmware that resolves both issues is released.
- Download firmware and update instructions from Micron: https://www.micron.com/products/storage/ssd/micron-ssd-firmware
- OEM systems (e.g., Dell, Lenovo, Supermicro) may require vendor-specific firmware packages. Always check with your hardware vendor for the correct update path and the latest firmware status.
Important Notes
- There is currently no firmware version free of both issues.
- If a panic state occurs on E2MU200 before updating, the drive cannot be recovered through normal means.
- After moving to E2MU300, treat power cycles as a risk event and keep them to a minimum.
Support
- Contact your hardware vendor for proper guidance on updating the firmware.
- OSNEXUS Support can assist with the update once you have confirmed your agreement to the Hardware Firmware Update Policy.
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