Mac OS X System Startup
This article walks us through what happens when a Mac OS X machine boots up. It also links to some other articles on other parts of a Mac's bootup.
"BootX tries to load a previously cached list of device drivers (created/updated by /usr/sbin/kextcache). Such a cache is of the type mkext and contains the info dictionaries and binary files for multiple kernel extensions. Note that if the mkext cache is corrupt or missing, BootX would look in /System/Library/Extensions for extensions that are needed in the current scenario (as determined by the value of the OSBundleRequired property in the Info.plist file of the extension's bundle." Mac OS X System Startup
(Submitted by Noel Mon Nov 7, 2005 )
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