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mkdir can only work if there is a real filesystem at the location.
There are no real directories in the psuedo-filesystem.
The pseudo-filesystem does support nodes that look like directories and have some of the properties of directories (like the node /mnt mentioned above).
But this is really an illusion.
I suppose that one could add the capability to create new, empty nodes in the pseudo-filesystem using 'mkdir' –
but I am not sure that this would really serve any purpose other than completing the illusion.
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[On
...
the
...
other
...
hand,
...
all
...
directories
...
are
...
really
...
an
...
_illusion_
...
in
...
a
...
way
...
and
...
I
...
suppose
...
that
...
in
...
that
...
sense
...
these
...
nodes
...
the
...
pseudo-filesystem
...
are
...
just
...
as
...
_real_
...
as
...
any
...
other
...
directory.]
After you mount the SD card at /mnt/sda, then you can do:
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