Seagate ST34321A Product Manual - Page 29

Medalist 8641, 6531, 4321, 3221 and 2110, Rev. B 21 3.0 ATA interface These drives use the industry-standard ATA task file interface that supports 16-bit data transfers. It supports ATA programmed input/output (PIO) modes 0, 1, 2, 3 and 4; multiword DMA modes 0, 1 and 2; and Ultra DMA modes 0, 1 and 2. The drive also supports the use of the IORDY signal to provide reliable high-speed data transfers. You can use a daisy-chain cable to connect two drives to a single AT host bus. For detailed information regarding the ATA interface, refer to the draft of AT Attachment with Packet Interface Extension (ATA/ATAPI4), NCITS T13 1153D, subsequently referred to as the Draft ATA-4 Standard. 3.1 ATA interface signals and connector pins Figure 4 on page 22 summarizes the signals on the ATA interface connector that the drive supports. For a detailed description of these signals, refer to the Draft ATA-4 Standard.