MacBook Pro Core 2 Duo running 10.4.9 does not appear to load the ext2fs.kext kernel extension.
If I run kextcache in verbose mode, this is what I get:
root# kextcache -k -v 6 /Library/Extensions
kextcache: adding repository /Library/Extensions
kextcache: scanning repository /Library/Extensions
kextcache: scanning directory /Library/Extensions
kextcache: found valid extension ext2fs.kext
kextcache: scanning directory /Library/Extensions/ext2fs.kext/Contents/PlugIns
kextcache: request to clear relationships while disabled; pending
kextcache: request to clear relationships while disabled; pending
kextcache: added repository /Library/Extensions
kextcache: request to clear relationships while disabled; pending
kextcache: clearing all version/dependency relationships among kernel extensions
kextcache: calculating version relationships
kextcache: resolving dependencies for all kernel extensions
kextcache: resolving dependencies for extension /Library/Extensions/ext2fs.kext
kextcache: looking for dependency of extension /Library/Extensions/ext2fs.kext with ID com.apple.kpi.libkern, compatible with version 8.0.0
kextcache: can't resolve dependency from extension /Library/Extensions/ext2fs.kext to ID com.apple.kpi.libkern; no extension with ID com.apple.kpi.libkern is known
kextcache: extension /Library/Extensions/ext2fs.kext is missing dependencies
Logged In: NO
same here, 10.4.10 intel.