Review: PC Stats
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When Intel introduced the Socket 775 platform and the ICH6 Southbridge, it did something radical, it removed a parallel IDE channel. Intel reasoned that the IDE standard had reached its maximum capability and that Serial ATA would quickly replace IDE due to its vast technological advantage.
Hard drive manufacturers quickly adopted the new standard however it still took the public a few years to move over. Optical drive makers on the other hand (aside from Plextor) have not moved over to the Serial ATA architecture and to the dismay of other manufacturers and consumers, continue to release primarily IDE devices.