The ATA and SCSI hard drive interfaces that are commonly associated with desktop and enterprise storage applications are examples of parallel bus architectures. These architectures will eventually transition to serial implementations to improve data signal integrity, enable smaller designs and overcome the bandwidth limitations of their predecessors. The new serial interfaces - Serial ATA (SATA) for PCs and workstations and Serial Attached SCSI (SAS) for mission-critical computing - have also been designed to improve performance, reliability and scalability. There are several attributes that combine to substantially reduce the total cost of ownership for desktop and enterprise storage.
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