You can also mount/umount your floppy/cdrom with amd ...
I don't have a NetBSD box to me, but I think there is an exemple around 
/usr/share/exemple/amd (for cdrom but easy to adapt for a floppy drive)


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>Subject: Re: floppy and cd-rom access and cd-rw drive
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>"John C. Hayward" <John.C.Hayward@wheaton.edu> writes:
>> I have a suid program called fmount and fumount for mouting floppies 
to a
>> directory we have called /a:.  Students can mount their msdos 
floppies.
>
>Why bother with that? mount already lets non-root users use it.
>
>> In general allowing non root users to mount netbsd floppies 
introduces
>> some security issues (user mounts the floppy with their own suid 
program
>> ...)
>
>Ah, but if mount is used by a non-root user this isn't an issue -- try 
>it out... :)
>
>Perry


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