Thank you again for contacting Samsung Support and have a good day. Newer versions of Linux kernels blacklist the drive so that Queued TRIM automatically is disabled. Linux will then start using Sequential Trim, which is similar to how Windows does TRIM. All we can tell you is that you can disable Queued TRIM in Linux. Since Linux is open source, Samsung does not support the OS. We apologize for any inconvenience this may be causing you. Thank you for contacting Samsung Support regarding your concerns and inquiries. Their mentally retarded response: 'Dear Customer, The exact same bug also affects the 850 PRO: įollowup: My email to Samsung clearly and succinctly stated that there is a bug in their firmware, where it wrongly reports 'I support NCQ TRIM!' but it really doesn't, and that they introduced the bug recently. I hope Samsung will get on this swiftly, and at least release an intermediary firmware which disables NCQ TRIM until they're ready to re-add it. Petersen from Oracle has contacts at Samsung and is talking to them to get it resolved in their firmware, see here: I have contacted Samsung via their regular tech support form and pointed out the NCQ TRIM bug and hopefully they will fix it. And Samsung are not yet aware that their NCQ TRIM is buggy. But the problem is that new 850 PROs from the factory come with the new, buggy firmware preinstalled. Samsung then pulled EXM02B6Q from their website for a DIFFERENT issue: The firmware update bricked many devices. Then, samsung released EXM02B6Q, which wrongly reports 'I SUPPORT NCQ TRIM!', but of course they don't the data corrupts if you try. Originally, they came with EXM01B6Q, which reports 'I do NOT support NCQ TRIM!'. The exact same bug also affects the 850 PRO: net/lists/ linux-ide/ msg50342. ata2.00: supports DRM functions and may not be fully accessible ata4: SATA link down (SStatus 0 SControl 300) ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300) ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Perhaps your sectors had electrically degraded to the point of data loss, and the firmware update simply marked them bad for lack of being refreshed. It's entirely possible that something else is at play here. Everything seems to be functioning fine for me. I do not have the discard option in fstab, but instead run fstrim weekly as is the default in ubuntu. So I have an 840 EVO, and have ncq enabled and am running the latest firmware.

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