![]() To visualize this another way, think about what's almost precisely the reverse process-converting parallel to serial for transmission and back again. When we've done all the processing and moving to get them all ready, we fire off that byte.Īt the other end of the cable, when the drive receives the bits, it must go through the reverse process to convert that byte back into a serial bit stream so the disk drive write heads can write it to the disk. Thus, before we can send a byte in parallel to a disk drive, we have to get those eight bits and line them up, funneling each to a different wire. ![]() We talk about bytes for convenience, but a byte is just a line of eight bits in a row, and ultimately, we have to process each bit separately. At current speeds, parallel transmission has several disadvantages.įirst, remember that data is stored and retrieved one track at a time, one bit at a time. Isn't parallel more efficient than serial, with more capacity? Not really, and certainly not anymore. At first glance, this seems counterintuitive.
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