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From: Kwoody <kwoody@citytel.net>
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To: freebsd-questions <freebsd-questions@freebsd.org>
Subject: Cdu31a cdrom
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I did it again...cd rom is mounted...I forget to umount the cd *before* 
opening it to change cd's and I'm hooped. Now I cant acccess the cdrom. 
All i get are media changed stuff. Also when I try and umount it now I 
get the message:

umount: /dev/scd0a: invalid argument
do an ls of /cdrom or try to chnage to the cdrom dir and get input/output 
error.

is there a way to re-read fstab or something, cause the only way to fix 
this in the past is the reboot. I hate rebooting.