Zagall Serial ATA-150/300 Cable, 18 Inches w/Locking Latch Lower voltage signal level: The level of voltage to the Serial ATA is of differential 500 mV, and it's more suitable for PC's technical request than that of 5 Volt Parallel ATA, and it can save more power as well Pin Pitch Advantage: Serial ATA connector includes a line of 7Pin signal terminal and a line of 15Pin power terminal. These two lines of terminals can be detached to the freestanding tie-in, therefore, it not only reduces its body size but also enlarge is trans-positional space Transferring Speed Advantage: It almost has no potential to fasten the transferring speed of Parallel ATA. But for the Serial ATA ,the transferring speed for its incunabular design is 150MB/s , and now it is striding forward to the speed of 300MB/s and even up to 600MB/s