Serial ATA was designed to overcome a number of limitations of Parallel ATA. The most significant limitation of Parallel ATA is the difficulty in increasing the data rate beyond 100 MBytes/s. Parallel ATA uses a single-ended signaling system that is prone to induced noise. Increasing the Parallel data rate beyond 100 MBytes/s would require a new signaling system that would not be backward compatible with existing systems. Hard disk drives, such as the Deskstar 7K500, 7K250 and 7K80 as well as the Travelstar 7K100 and 5K100 series currently outrun the 100 MByte/s data transfer rate. As a result, a new interface system has been defined to accommodate the faster processing capabilities of next generation high-speed desktop, notebook and entry-server architectures.
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