IDE and EIDE are effectively the same interface. The difference is that EIDE is an enhanced peripheral interface, allowing for high-speed data transfer and lower latency communications. E means 'Enhanced'.
EIDE was typically used to describe Ultra 33, Ultra 66, Ultra 100, and Ultra 133 ATA modes with DMA (Direct Memory Access), rather than older PIO (Peripheral Input/Output) modes which were slower and required more overhead.
It has often been mistaken to mean 'external'. This is not correct.
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