It would be easier if I knew what module FC2 is loading to try and support the FT S150 TX. After FC2 has booted, check:
To see what modules are loaded and post back with the whole list. My guess is sata_promise.ko, but that's a guess. You can then either remove that module entirely... and this is hoping that it is a module, or recompile the kernel around it even having support for the FastTrak in the first place.
Most likely, since FC isn't mounting the disks at all, just trying to queue them, no, its not doing any damage, but the kernel maintainers pretty much gave up on these pseudo-hardware RAID cards, especially if we're talking Raid1 or Raid0, where software raid is safer, more reliable, and yes... faster. If its Raid1, it might deparrallelize the array and require a rebuild, annoying enough without XP's quirkiness to add into the mix.
P.S. - Go Yankees