Symlink not permanent

[Rodolfo Medina <rodolfo.medina@gmail.com>]

I do:


 # cd /dev

 # ls -l cdrom
 lrwxrwxrwx 1 root root 3 2008-01-14 16:34 cdrom -> hdb

 # rm -vi cdrom
 rm: remove symbolic link `cdrom'? y
 removed `cdrom'

 # ln -s hdc cdrom

 # ls -l cdrom
 lrwxrwxrwx 1 root root 3 2008-01-14 16:42 cdrom -> hdc


, but then when I reboot the symlink points to hdb back again!  Why that, and
how to work it out?  How to make the symlink permanent?

Thanks for any reply
Rodolfo