48-bit LBA proposal

Word 2 bit 2 is cleared to select no support for Ultra DMA mode 2 and has the effect of clearing bit 2 in word 88 of the IDENTIFY DEVICE or IDENTIFY PACKET DEVICE response. This bit shall not be cleared if Ultra DMA mode 5, 4, or 3 is supported or if Ultra DMA mode 5, 4, 3, or 2 is selected. ................
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