This doesn’t break compatibility, though, and you can still use USB 3.0 devices with USB 2.0 hosts via either cable type or USB 3.0 hosts with USB 2.0 devices via a USB 2.0 cable. The problem lies with the B-connector which no longer fits into USB 2.0 devices. The A-connector wasn’t changed too much and still fits the old USB 2.0 hosts. Aside from the four wires already found in USB 2.0 cables, USB 3.0 adds four more which are only necessary when utilizing “Superspeed.” The connectors have also been modified in order to provide the necessary connection for the additional wires. In order to achieve the greater data throughput provided by “Superspeed,” more wires needed to be added. But this is not so good news for laptops which need to supply a greater amount of power. The greater amount of power that can be drawn is a good thing for devices that need slightly more than 500mA as they would no longer need to rely on a separate power cable. USB 3.0 increases the per unit load by 50% to 150mA and the maximum units that can be drawn to 6 resulting in an overall maximum of 800mA. While unconfigured devices can only draw one unit of power, configured devices can draw 5 units for a maximum total of 500mA. USB 2.0 only provides 100mA per unit load of power. In contrast, USB 3.0 multiples that more than five-fold with its “Superspeed” transfer mode achieving 400MB/s or 3.2Gbit/s maximum throughput.Īside from improvements in speed, USB 3.0 also increases the maximum power that can be drawn by devices. USB 2.0 added “Hi-Speed” with a maximum throughput of 480Mbit/s or 60MB/s. The best feature for USB 3.0 is speed, and it is the biggest difference between the two. The latest version is USB 3.0, and it is the most radical change in terms of features and performance.
This is true with USB (Universal Serial Bus), and it has gone through a couple of updates to improve its performance. Just like any other computer technology, or any technology for that matter, time catches up with it, and the current specification becomes inadequate for current and future uses.
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