I'm guessing this is bad, right? [Mon Jul 29 12:59:48 2019] print_req_error: critical medium error, dev nvme0n1, sector 296089600 flags 80700 [Mon Jul 29 12:59:48 2019] print_req_error: critical medium error, dev nvme0n1, sector 296089744 flags 0 Is it an oh-shit-get-yerself-a-new-drive-NOW thing, or …? Drive is a 2+ year old Intel 512 GB SSD. Not entirely sure what the right diagnostics are for SSDs. Filesystem is showing clean but touching certain known-bad files triggers the error in the system log. Dunno if these nvme stats are useful: Smart Log for NVME device:nvme0 namespace-id:ffffffff critical_warning : 0 temperature : 25 C available_spare : 85% available_spare_threshold : 10% percentage_used : 1% data_units_read : 10,349,479 data_units_written : 10,098,299 host_read_commands : 183,018,841 host_write_commands : 136,702,227 controller_busy_time : 1,342 power_cycles : 201 power_on_hours : 15,722 unsafe_shutdowns : 10 media_errors : 803 num_err_log_entries : 844 Warning Temperature Time : 0 Critical Composite Temperature Time : 0 Thermal Management T1 Trans Count : 0 Thermal Management T2 Trans Count : 0 Thermal Management T1 Total Time : 0 Thermal Management T2 Total Time : 0 Any suggestions, please, for: * what I should be looking for in stats (nvme smart-log-add doesn't give me anything at all, so no wear-levelling stats) * a decent brand to replace it with. I'm likely okay with a SATA SSD. cheers, Stewart