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I got a new TS256GSSD320, I'd like to put on the trim.

I have edited /etc/fstab with discard on the boot partition but the trim is still off.

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Well, it should had worled. please see this answer that explains more about ssd on ubuntu. Link: How to enable TRIM?

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I did the procedure already but it s not working –  enjoy Oct 25 '12 at 21:44
    
sudo hdparm -I /dev/sda | grep TRIM * Data Set Management TRIM supported (limit 1 block) * Deterministic read data after TRIM –  enjoy Oct 27 '12 at 19:38
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