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ATA PIO Mode: Difference between revisions
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According to the ATA specs, PIO mode must always be supported by all ATA-compliant drives as the default data transfer mechanism.
PIO mode uses a tremendous amount of CPU resources
However, when a computer is just beginning to boot, there are no other processes. So PIO mode is an excellent and simple interface to utilize during bootup
Please note that this article deals with what are now styled PATA hard disks, as opposed to SATA hard disks.
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