2
This is completely hypothetical, and just something I've been curious about. I remember Grace Hopper on Letterman talking about correlating lengths of wire to nano seconds (a certain length of wire was the equivalent of the distance light travels in one nanosecond), and wondered if that could apply to internal components inside a host.
Imagine if I have two hard drives, A and B, where they both exactly the same, only difference is length of cable connecting the two (A has a 20 cm cable, B has a 30 cm one) to the motherboard. Would A have any difference in performance, would it be just slight faster, or is the difference so insignificant that the processor wouldn't be fast enough to notice it?
I don't know about IDE/SATA, but length of a data bus can be very important. In the SPI bus, the clock for the data always comes from the master. When clocking data out of the slave at a very high rate, it's possible for the data to arrive at the master's end that is no longer coincident with the clock, causing bad data to be received. This is completely due to the length of wire. – Steve – 2014-07-23T19:23:46.520