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I just recently set up a new PC with an SSD/HDD combo; my Linux partition on my SSD is mounted as / with /home mounted on my HDD.

I have the noatime and discard flags set for my SSD in /etc/fstab, but just to see what would happen I ran fstrim from the terminal when I rebooted a few times. When I do it, the return is:

~> sudo fstrim -v /
/: 54.9 GiB (58889682944 bytes) trimmed

for reference, 54.9GiB is also the amount of free space on my 60GiB partition.

Is my entire partition being rewritten between each boot, and should I be concerned for my SSD? Is this just a result of having the discard flag enabled AND using the fstrim command? Should I only use one TRIM method and not the other?

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