I have run my PowerMac G4 with three SATA-PCI cards (and a Sonnet CPU Upgrade) for almost three years, if not more in this configuration, with no problems so far. Lately it happened, that a drive on the Sonnet card did disappear or wasn't accessable (opened icon, opened folder, and then beach ball). I then restarted it and it was ok, till the next morning. This happened three times. Then I got kernel panics and the Mac would freeze after the grey Apple logo would appear (the circle not having started to rotate). I unplugged and moved around drives with no success. Then I read what it actually said in the kernel panic by holding cmd+v. I found a projovian.driver being loaded as last. I googled and found an allready existing thread with this kernel panic (though the CPU caller was different). It is my MacAlly SATA-card, that had NO drives attached when the problems started. So I pulled the card and the Mac came back with the boot-drive. But System Profiler did not show the other cards anymore. I moved them around: the Sonnet came back. Moved the SIL3124-"PC"-Card again to another slot and it was back, too. But the drives were not showing on the Sonnet card. I put them besides the others on the SIL-"PC-Card (all drives on this card, instead of two here and two there). Now all drives showed up (interestingly also one Samsung 2TB that wasn't shown on the SIL-card three days before (which is why I had put it on Sonnet card). Today, I put in the Macally card again and everything works with no problems. Strange. I wonder, what this is or what the reason was for this. Also hope it does not come back again. (PS: I did PMU resets in between, but this didn't make the kernel panic go away.) Edit: also the card no show up in strange order: C - SIL B - Sonnet D - MacAlly. I remember it was A-B-C before.