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ATA PIO Mode: Difference between revisions
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PIO mode uses a tremendous amount of CPU resources, because every byte of data transferred between the disk and the CPU must be sent through the CPU's [[Inline Assembly/Examples#I\O access|IO port bus]] (not the memory). On some CPUs, PIO mode can still achieve actual transfer speeds of 16MB per sec, but no other processes on the machine will get any CPU time.
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