Charles,
Forgot to mention that I'm using an IBM 60GXP hd and I've been able to run at 160 Cas 2/2/2, PCI at 40 with no data corruption at all--at 157 that I'm at now, the PCI is at 39 and running fine---Also, I "always" use a mirror backup HD for protection---thanks for your concern though!
Delray