thaks to all for your answers. I took a desition before yours back and I'd like to share with anybody there with the same matter:
I search for the best driver performance ata/ide internal and ohh!!god; I bought the Maxtor DMA/66,72k rpm and easily installed and work just PERFECT, faster than the "SCSI drive"? and than any other drive manufacter, yes!!! faster than any others,like you hear!! and so quite and smooth.It was tested againts other drivers and the results was just better. Get info at
www.yourapple.com and see by yourself.
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Ricardo