Hi Franck, Thank you for your outstanding support. I'm really impressed regarding responsiveness and how quickly this issue has been solved (considering complexity). Just to have full picture. My hardware is Dell Latitude E5470 and problematic disk: 03:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 0115 (rev 01) (prog-if 02 [NVM Express]) Subsystem: Toshiba America Info Systems Device 0001 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at ef000000 (64-bit, non-prefetchable) [size=16K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+ Capabilities: [70] Express Endpoint, MSI 00 Capabilities: [b0] MSI-X: Enable+ Count=8 Masked- Capabilities: [100] Advanced Error Reporting Capabilities: [168] Alternative Routing-ID Interpretation (ARI) Capabilities: [178] #19 Capabilities: [198] Latency Tolerance Reporting Capabilities: [1a0] L1 PM Substates Kernel driver in use: nvme Kernel modules: nvme Thanks a lot. BR, Dariusz