USB 2.0 Devices and 1.1 Compatibility

Discussion in 'Computers' started by Elizabeth S, Dec 22, 2003.

  1. Elizabeth S

    Elizabeth S Producer

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    I have what is probably a very elementary question. . .

    I wanted to get a card reader and I have a USB 1.1 port. Planning ahead, would I be able to use a USB 2.0 card reader, though I wouldn't get the full speed benefit? Should every 2.0 card reader be backward compatible, or would it depend on the model?

    Thank you! [​IMG]
     
  2. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    USB 2.0 devices are supposed to be backward compatible, they'll just operate at USB 1.1 speed.

    There are some devices that really need the USB 2.0 speed and wouldn't work well at 1.1 speed. But I wouldn't expect a card reader to be one of them.
     
  3. Elizabeth S

    Elizabeth S Producer

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    Thank you, Wayne! [​IMG]
     
  4. Grady Reid

    Grady Reid Stunt Coordinator

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    Saw this thread- thought I'd ask my own question...
    I have a couple of old USB 4:1 hubs from a few years back- before the days of USB 2.0. If I plug a USB 2.0 product into the older hub, will it transmit the data at 2.0 speeds or 1.1?
     
  5. Patrick Sun

    Patrick Sun Studio Mogul

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    IIRC, USB 1.1 at best. Unless the device has the USB Highspeed label on it, it'll operate at 1.1.
     
  6. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    I agree. In networking terminology a USB hub has to behave more like a "switch" than a hub. If it's a 1.1 hub, then everything you connect to it will work only at 1.1 speed, and the devices will not even be aware that the hub's connection to the computer is capable of 2.0 speed. They will know only that they are connected to a 1.1 port.
     
  7. Brett DiMichele

    Brett DiMichele Producer

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    Wayne,

    I just wanted to expand on one thing.. A Card Reader is
    certainly one of those things that you need USB 2.0 or
    Firewire on.. USB 1.1 on a Card Reader? Sloooooooow..

    I was running my USB 2.0 7in1 Card Reader on my USB 1.1
    ports and to transfer 56 Raw images from my CF Cards it
    took more than 30 minutes.. (My Raw files are 10MB each and
    I can only shoot in Raw [​IMG]

    Any of these 3+ Megapixel Digicams need a USB 2.0 if you
    are shooting in Raw, Tiff or SHQ Jpeg.
     
  8. Mark Paquette

    Mark Paquette Supporting Actor

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    I have a cradle for my Phatbox MP3 player, which is essentially a 20GB hard drive. Anyway, the cradle is USB 2.0, but if I plug it into a USB 1.1 port on my PC it still works just verrrrrryyyyy sloowwwwww. 1 CD worth of tunes takes about 20-30 minutes over 1.1 and about 3-5 minutes over 2.0.
     
  9. Patrick Sun

    Patrick Sun Studio Mogul

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    Well, the theoretical difference in throughput between USB 1.1 and USB 2.0 is 12Mbit/sec vs. 480Mbit/sec, so there's quite a bit of disparity in transfer speed.
     
  10. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    I assumed by "card reader" Elizabeth meant a magnetic stripe card swipe reader.
     

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