EIDE refers to an interface standard developed by Western Digital, since around the end of 1994 EIDE controllers have been widely used in the PC industry surpassing the earlier IDE standard due to its faster data transfer rates.

The interface controls storage devices like hard drives, CD ROM drives, and CD Writers.

Seagate introduced their own implementation of the EIDE standard and is commonly known as Fast ATA.

Typical EIDE transfer rates are up to 16.6 MBps, the newer Ultra ATA standard which is a variation of EIDE but developed by Seagate can reach data transfer rates of up to 33 MBps.

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