There was a kernel bug that made TRIM lose random data. Samsung submitted a patch to the kernel. Is it applied in elementary OS? Or only new kernel versions? Do I need to update?

How can I find out whether TRIM is used on my system?

Is my 8-serie SSD just blacklisted for TRIM-operations, or does everything work as it's supposed to?

  • As far as I know TRIM should be enabled automatically during OS installation if the disk supports it. The Algolia blog reports they use 3.16.0-31 kernel and this series was also present in the first release of Freya (not sure what kernel is in the recent respin). So I think you should get the patch in some update sooner or later. What kernel do you actually use? You can find out with a command uname -a
    – jena
    Dec 23, 2015 at 10:02
  • I'm now on work PC but i recall it is 3.19.0-49 now, not sure about 49 part, 4x something anyways. Can I somehow check if TRIM is enabled?
    – tuomas-
    Dec 23, 2015 at 10:25
  • it seems the easiest way to check if trim is working on your machine is to use the command from here: askubuntu.com/questions/464306/…
    – jena
    Jan 2, 2016 at 11:25
  • if you have more partitions (e.g. separate /home partition), you can repeat that test for each partition by replacing the "/" with e.g. "/home"
    – jena
    Jan 2, 2016 at 11:26
  • 2
    Possible duplicate of How do I optimize my SSD with Trim in Freya?
    – Suici Doga
    Jan 26, 2016 at 2:14

2 Answers 2


from reading the messages on the kernel mailing list I understand that the data loss only is a problem when using the SSD in a raid0 or raid10 configuration. They have fixed the bug in the kernel, but I can't seem to find in which version the fix was released.


I cannot say much from the theory point of view. My knowledge of the linux kernel is quite limited, but I use elementary Freya since beta with a Samsung 840Pro and have never ever experienced any problems. Cannot guarantee it is safe, but there is at least positive evidence from my example.

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