persistence in freeBSD

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Thanks for replying, Steve.

As for your question, I mean if it is possible for example to write a file  
to the filesystem and that the file will not be deleted on the next boot.  
actually, I didn't succeed to write a file to the filesystem  because it  
is automatically mounted as readonly filesystem, so my question implies  
also how to mount it also with write access during the boot process.

Regards,

atar.