TLDR
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fstrim

 
Discard unused blocks on a mounted filesystem. Only supported by flash memory devices such as SSDs and microSD cards. More information: https://manned.org/fstrim.
 
  • Trim unused blocks on all mounted partitions that support it:
     
    sudo fstrim --all
     
  • Trim unused blocks on a specified partition:
     
    sudo fstrim {{/}}
     
  • Display statistics after trimming:
     
    sudo fstrim --verbose {{/}}

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