https://www.netbsd.org/docs/guide/en/chap-exinst.html#exinst-from-cdrom optic medium -> optical disc ("optical medium" would also be an improvement over "optic medium", yet not as good as "optical disc")
https://www.netbsd.org/docs/guide/en/chap-exinst.html#exinst-from-cdrom optic medium -> optical disc ("optical medium" would also be an improvement over "optic medium", yet not as good as "optical disc")