PowerMac G4 FireWire 800 freezes/crashes-post modification 300GB drive

wondering if anyone one had any insight into this problem:
I recently installed a 300GB internal drive into my G4, running on the same carrier as the one that came with the computer, both on the ATA/100 bus, the rear carrier.
The system software and apps are still on the original 80GB drive and I'm using the new drive for storage.
Occasionally the computer crashes/freezes, mostly when I'm trying to shut down the computer, forceing me to force a shut down.
Wondering if moving one of the drives to the front carrier, ATA/66 bus might solve the problem? I would appreciate any help/insight anyone could give me.
-Steve Hastings
PowerMac G4 (FireWire 800)   Mac OS X (10.3.9)  

Apple Hardware Test is not Disk utility. its a separate ROOT type test that checks everything with your computer. normally some version of AHT came with your system discs.
Diskwarrior just checks the drive index, its like a "roadmap" program, when your run DW it checks this roadmap and will allow you rebuild the map which tells the Drive where to look for stuff. sometimes those directions get fuddled. instead of actually moving the "roads" or building new ones, DW changes the map to reflect how the data on the drive appears. DW DOES NOT physically alter your HD.
if you are having other system stability concerns you might download YASU 2.0 from versiontracker or macupdate. its donationware app that allows you to clear all sort of system caches and logs and safari junk, and run various CRON scripts from a simple GUI.

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