On Sat, 20 Mar 2021 00:00:55 -0000 (UTC), Martin Gregorie
 declaimed the following:


>
>I assume from this that by design fstrim does nothing when pointed at a
>partition on and SD card. Can anybody confirm this? The manpage is silent
>about using in on SD cards.
>
 It does, however, state:

"""
-a, --all
              Trim all mounted filesystems on devices that support the
              discard operation.  The other supplied options, like
              --offset, --length and --minimum, are applied to all these
              devices.  Errors from filesystems that do not support the
              discard operation, read-only devices and read-only
              filesystems are silently ignored.
"""

 I would suspect SD cards do not have "discard" (after all, they are,
for the most part, optimized for FAT file systems)


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