fstrim with Buster

[Head_on_a_Stick]

fstrim/emmc

Run

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lsblk --discard

and check the DISC-GRAN (discard granularity) and DISC-MAX (discard max bytes) columns — non-zero values indicate TRIM support.

Alternatively, install hdparm and use

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# hdparm -I /dev/sdX | grep TRIM

Replace X with the appropriate drive letter.

Sample outputs:

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empty@shinken:~ $ lsblk --discard
NAME   DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
sda           0      512B       2G         0
├─sda1        0      512B       2G         0
├─sda2        0      512B       2G         0
└─sda3        0      512B       2G         0
empty@shinken:~ $ su -c '/sbin/hdparm -I /dev/sda | grep TRIM'                   
           *    Data Set Management TRIM supported (limit 1 block)
empty@shinken:~ $

As you can see, my drive supports TRIM

[shep]

My emmc does support trim and I implemented it. This reminds me of medicine: Here, take this pill. You will not feel any better but will benefit in the long run. Trust me.