Serial ATA internal drive not mounting to desktop

I installed a serial ATA Seagate Barracuda 7200.9 Hard Drive - 300GB in my G4 MDD. I had previously installed a 120GB Seagate SATA drive into this same computer and it was immediately mounted onto the desktop after rebooting. However, that didn't happen this time. The drive installed easily but it is not mounting on the desktop. It is attached to the same PCI card as the other SATA drive. When I open disk utility, it does not show up as a SATA drive but as an ATA drive and it says it is not S.M.A.R.T compatible. What have I done wrong in connecting this drive???? Any suggestions would be most helpful
Dual 1.42 Ghz PowerPC G4 Mac OS X (10.3.9) 2 GB DDR SDRAM

Hi
If I remember correctly Seagate initially shipped the 7200.9 drives with something called Spread Spectrum Clocking (SSC) enabled. This isn't supported by most PCI SATA cards (or inbuilt SATA controllers come to that) and the drive won't work. I think Seagate made a utility available to switch if off, but it was Windows only and the drive had to be installed in a PC first.
I'm not sure whether this is the cause of your problem, but more info can be found here:
http://www.xlr8yourmac.com/archives/nov05/111105.html (scroll down a bit)
http://www.xlr8yourmac.com/archives/nov05/110905.html#S20080
http://www.seagate.com/support/kb/disc/faq/ssc.html

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