EIDE 
Enhanced Integrated Device (or drive) Electronics 
An enhanced version of the PC platform's IDE interface, EIDE increases the previous maximum size of hard drive it can access from 504MB to more than 8GB, speeds up the data transfer rate more than twice, and doubles the number of drives the PC can contain, bringing the number up to four. While most people agree that SCSI-2 is technically superior, EIDE is cheaper to implement, which gained it widespread acceptance.