Refresh your SSD

Just like yourself, your SSD likes to have some rest from time to time to perform well on the long run. After some use, it gets slower and slower if it isn’t told which parts of it are still in use and which hold only garbage. This is due to the internal workings of the disk that I won’t go into here. If you’re interested in the gory details, please head on to Wikipedia: TRIM.

On Ubuntu, you can refresh your SSD with the fstrim command:

sudo fstrim -v /

This applies the optimizations to the root filesystem. If there are other filesystems that are mounted from an SSD, replace the single slash by the path to the mount point(s).

On my laptop, which is equipped with a 250 GB Samsung SSD 840 drive, you get the following results:

New SSD

Measurements taken directly after the initial OS installation on the new drive. The performance measurements were taken using the Gnome disk utility called “palimpsest” (sudo apt-get install gnome-disk-utility).

Used SSD

Measurements after 8 months of use.

SSD after trimming

Measurements after running fstrim.

After trimming, the SSD is not as fast as when it was new, but the average reading transfer rate improved by 15%.

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