xpostfacto removes the 8gb limit if the drives larger then 8gb. if you was to try to install OS X (testing using 10.2) on the 120gb hdd without xpostfacto it will not allow you to select where to install to. with xpostfacto (version for tiger) you can install on the 120gb HDD.

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xpostfacto uses a partition with a Mac OS 9 installation in an appropriate place to work around the 8 GB limit. This installation may be small, just sacrifice a few hundred MB from a large hd for this purpose, and you need not to worry about partition size and location for any other installations, Classic or X. It allows to boot the beige G3 from a FireWire attached drive, also (this might be worth a try regarding hd performance). My beige G3 uses the onboard video as well as the Radeon without any problems in 10.2.8, but without the Quartz Extreme hack. DVD playback works fine even in a window drawn to fill both screens. If anything goes wrong, you can easily fall back to the helper installation of OS 9 by depressing the option key during startup.