ultra3333 MM BUT AERO The streamd desn of the central part of the hub decreases the frontal area of the component whilst the special desn of the flanges favours the shut-off of the flowIn the second half of 1997 EIDE’s 16.6 MBps limit was doubled to 33 MBps by the new Ultra ATA (also referred to as ATA-33 or Ultra DMA mode 2 protocol).