PCI overclocking can damage a hard drive, depending on the controller, although I haven't heard of that lately.
I prefer to overclock to a normal FSB with good dividers for the PCI, 100 to 133, 133 to 166, etc.
although currently my laptop is stable with a 40mhz PCI, so my stance may change...
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Independant thought is good.
It won't hurt for long.