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Neil, With all pulse widths into the IDE device dependent on CPU instructions, I'd say the PPIDE speed is directly proportional to CPU clock frequency. --John On 07/20/2011 01:34 PM, nbreeden wrote: Max asked: How does it run at 18.432? I have found that logging in a hard drive take a few seconds at 12.288. At 6.144MHz the IDE was pretty slow. I'm using a CF adapter / CF card. Changing directory to C: or D: took a few seconds. At 18.432 the IDE is quicker, I'd say under a second to change directory too. I don't know if having the CPU clock 3x faster equates to 3x reduction in IDE access time? -Neil |