Berkeley CSUA MOTD:Entry 36772
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2024/11/23 [General] UID:1000 Activity:popular
11/23   

2005/3/19-20 [Computer/HW/Drives, Computer/HW/CPU] UID:36772 Activity:high
3/19    Given the choice between a firewire and USB2.0 connection
        (between an external hard drive and my computer), which one is
        better and why? Thanks.
        \_ Firewire is faster and more robust for that application.  USB
           is more widely available if you'd ever want to move the disk to
           another machine.  -tom
        \_ Interface-wise, FireWire is better technically speaking, but to
           most users they see no difference.
           As tom said, you see USB 2.0 on more notebooks and desktops than
           FireWire, because Intel p0wnZ dat f00l st3vee j0b5, I mean,
           Intel produces mobo chipsets with USB 2.0 on-board as a std feature.
                \_ Cool, thanks for the responses.
        \_ Firewire.  It's peer-to-peer instead of host/client, so you don't
           load your CPU while transferring data.  You can burn one CD while
           ripping another one, etc.
           \_ nothing personal, but this is a fine example of the utterly
              bizarre, meaningless techno-babble advice often disgorged
              on the motd.  what happened to the CS in CSUA?
           \_ Uhm, the firewire peer to peer connectivity between computers
              has nothing to do with how efficiently peripherals functions.
              The spec has provisions for peer to peer networking which
              would allow for fast grid computing. This doesn't mean you
              get higher efficiencies when transferring information to a
              CD burner.
        \_ http://csua.com/?entry=35792  (specs)
           http://csua.com/?entry=12107  (speed)
           Also just search for "usb firefire" on Kais Motd
2024/11/23 [General] UID:1000 Activity:popular
11/23   

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Cache (63 bytes)
csua.com/?entry=35792
USB upside-down looks the same unless you look inside the plug.
Cache (976 bytes)
csua.com/?entry=12107
One would think that each is twice as fast as the one before. But with the way AGP is speced, all requests must round up to the nearest common clock (running at 15ns). So in 8x, 32-bytes can be transfered in 1 reference clock cycle but if the GPU makes a 16-byte request, half the bandwidth is thrown away. Also, because AGP is a shared bus, turn-around cycles will cause performance degradation when the bus alternates direction. My guess is that USB is more vulnerable to these kinds of things than 1394 is. And then there're those manufacturers that label USB 11 devices as USB2. The bastards put a 20 cable on a 11 device and *lie* calling it a 20 device. html \_ USB 20 Full-Speed == USB 11 \_ USB has a lot of overhead. Plus, when dealing with USB 2 devices, you need to look for the "hi-speed" label (not "full-speed") \_ USB is designed to be cheap and has very simple wiring. Firewire has better electrical characteristics, but costs more to implement and to wire up.