I just put a 160GB on my KK266 and it choked in Windows. However, it would work (or at least appear to work) with Mandrake 9.1. I created a couple of Win partitions with Mandrake, but whenever I wrote something to one of them in Windows, it actually wrote to both partitions... wierd!?
Got a Promise/Maxtor Ultra-ATA133 card and now everything is bueno.