This is for my fellow computer lab managers interested in dual-boot labs.
Attached files: refit.efi and refit.conf
Added to the end of the conf file:
# Disable the ability to boot from the optical drive, external drive,
# and/or internal drive. (Does not prevent rEFIt from scanning drives for
# bootloaders.) This is intended as a quick fix to not display certain
# volumes based on the media type.
#
#disableopticalboot
#disableexternalboot
#disableinternalboot
Simply uncomment whatever device type you want to disable.
disable booting from devices by type using switch
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I tried the Disable boot options from conf file with a new iMac and it doesn't work, but it works fine on an older Mac Mini.
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I'm trying to get my hands on an iMac to test. Do you know if it was a MA876LL, MA877LL, or MA878LL?
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rEFIt 0.11 was released, the official binaries now have these options.