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usb

  • 18-11-2007 8:41pm
    #1
    crazeehorse
    Registered Users, Registered Users 2 Posts: 136 ✭✭


    whats the dif between usb and usb2.0?


Comments

  • #2
    cornbb
    Registered Users, Registered Users 2 Posts: 6,790 ✭✭✭cornbb


    Moved from Recording & Mixing & Pro Audio. Mods, feel free to move it back if it turns out the OP's query is specific to pro audio equipment.


  • #3
    Dregon
    Closed Accounts Posts: 276 ✭✭Dregon


    USB 1.1 has a maximum transfer rate of 12Mbits/second, where as USB 2.0 has a maximum transfer rate of 480Mbits/second.

    I don't think that theres any other difference than the speed.


  • #4
    dulpit
    Registered Users, Registered Users 2 Posts: 12,379 ✭✭✭✭dulpit


    USB is the original, USB 2.0 is the newer & improved version... Speed is the main difference (as said USB is 12Mbits/second, USB2.0 is 480MBits/second)

    Seemingly they're working on a USB 3.0 which will be 10 times faster (roughly 4.8Gbits/second)

    (See here)


  • #5
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    These are clock speeds. In reality achievable transfer speeds are much lower.

    USB 1.0 was even slower and was not much used. Most everything is USB 1.1 or USB 2.0. The USB 2.0 allows 500mA max @ 5V. USB1.1 may have lower current limit. The USB2.0 connection on a Express Card slot can be used for USB devices, but the Express card slot only has 3.3V supply, not the 5V. The rest of the pins on Express Card (that replaces Cardbus/PCMCIA on newer PCs) implement a kind of PCI express connection. This is why only some Express Cards work in a USB 2.0 adaptor and not on a USB 1.1 port and only if the Express Card is in reality USB only.

    400Mbps Firewire is two to three times faster than USB 2.0 in real life, at usually lower CPU load.

    The other issue with USB is that one end is Master and the other is Slave. There is no peer to Peer mode. A serious flaw due to original intention of design as only for things that are slow perpherials only, such as keyboard, mouse and Joystick. Ironically Apple Talk (basically RS485) already did that and peer to peer at USB 1.0 speeds.

    USB to Go is simply combining Host/Master and Client/Slave connections in a single connector to allow an external host PC or Slave perpherials. It's not peer to peer either.


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