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PIO is an old ATAPI accronym (can't even remeber what it stands for) DMA (Direct Memory Access) bypasses certain things and give more direct thus faster access, i can't remember the specifics and in depth reasons all i know is its faster and better!!!
 
Ahh ic well thats good 2 kno i hade my 60gig Maxtor on PIO and now its on DMA not sure if i see a diference but hey im not gona complain =p
 
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