The older 5400 rpm Maxtors were horrible for overclocking, they'd corrupt if the PCI clock got over 35 MHz. But the newer 7200 models are a different story. I picked up a Maxtor 15 GB 7200 rpm drive and it's a good as my old Western Digital - 41 MHz was no problem. Hopefully that 10.2 GB 5400 rpm Maxtor isn't your boot drive. If it is, change everything around and boot off of the 13.2 GB 7200 rpm Maxtor. It isn't the latest model though, so I can't say for sure it'll be as good as my 15 GB Maxtor. But, with the FSB at 133 MHz, your 1/4 PCI divider would have had the hard drives on spec at 866 MHz, so I don't think that's your problem anyway.
But, I don't like that you're using that PC100 SDRAM. Running that a 133 MHz is a real stretch and could lead to all kinds of problems, including registry corruption. So, if you're gonna reach for the heavens, get some better SDRAM - Mushkin or Corsair are recommended.
1.Old Antec Case, Asus PC-DL, 2 x 1.6 LV D1 Xeons @ 3 GHz, 2GB Corsair PC3200 @ 200 MHz, Chaintech 6800 128MB AGP
2. Old Crap Beige Case, Gigabyte GA-H55M-S2H, Core i3 530, 4GB CL8 OCZ DDR3-1600, eVGA GTX465
3. Asus Pundit mATX Case, MSI AMD Zacate E350/dual core E350IS-E45 mini-ITX, 4GB CL9 Crucial Ballistix DDR3-1333, LG Blu Ray/HD DVD & DVD Burner