AOpen MX4GVR - Ultra DMA; USB (Universal Serial Bus)

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Ultra DMA (or, more accurately, Ultra DMA/33) is a protocol for transferring data between a hard disk drive through the computer’s
data path (or bus) to the computer’s random access memory (RAM). The Ultra DMA/33 protocol transfers data in burst mode at a
rate of 33.3MB/s, twice as fast as the previous Direct Access Memory (DMA)
interface. Ultra DMA was developed as a proposed
industry standard by the Quantum corporation, makes of hard disk drives, and Intel, makes of chipset that support computer bus
technology. Ultra DMA support in your computer means that it will boot (start) and open new applications more quickly. It will help
users of graphic-intensive and applications that require large amounts of access to data on the hard disk drive. Ultra DMA uses
Cyclical Redundancy Checking (CRC), offering a new level of data protection. Ultra DMA uses the same 40-pin IDE interface cable
as PIO and DMA.
16.6MB/s x2 = 33MB/s
16.6MB/s x4 = 66MB/s
16.6MB/s x6 = 100MB/s
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USB is a 4-pin serial peripheral bus that is capable of cascading low/medium speed peripherals (less than 10Mbit/s, but the newly
designed USB2.0 has a fancy speed of up to 480Mbps) such as keyboard, mouse, joystick, scanner, printer and modem. With USB,
the traditional complex cables from back panel of your PC can be eliminated.