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Navigation: Home > Hardware Info Library and Tips
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This page has been provided to help shed some light on the importance of each type of device that is commonly installed in or available for today's computers.
Normally, the standard PC motherboard is able to only handle up to 4 ATA devices. This limitation was designed during the development of the on-board ATA controller architecture. The ATA/UltraATA controller performs the work of directing data to and from the connected drives via a process called "Bus Mastering". This technology yields two parallel channels per bus, and two bus lines on the board's PCI-to-DMA structure; therefore 2x2 or 4 devices. In order to break this limit, PC component manufacturers have devised add-on and advanced bus controller schemes. Common alternatives are SCSI, SerialATA, and PCI UltraATA controllers. The PCI (or expansion) controller adds drive connectivity using plug-in boards attached via the PCI (peripheral component interconnect) interface. Related:
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