Western Digital 1TB Hard drives

[hugonaut]

I installed a 1TB Western Digital(WD) hard drive too my XP PCI computer. Protools 8.1CS2 doesnt seem to like it - comes up with error stating the drive is too slow to handle the throughput of data, and that it might be too fragmented, or an external firewire drive. I'm talking moderate track count, about 12 audio tracks, one or two instruments, and a couple of modest plugs. Its an internal WD Caviar Green, the mid-range model, 720000rpm,with 64 mb cache - it should easily be fast enough. I'm wondering if it might be a conflict going on, like some part of the system doesnt recognize a 64mb cache, or similar. The 8.1 software works with my older 200gb seagate with 8mb cache. Thanks.