what is the bus connecting mother board to hard disk?

what is the bus connecting mother board to hard disk?

hi,don't think it refered to a bus for MB to hdd, its data transfer cable ,measured in bit's per second , i think. the harddrive may have a bus speed up to 133 if its a ide drive.
some speed listed here ,for sata nd other type drives .http://en.wikipedia.org/wiki/Serial_ATA#SATA_and_SCSI

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