Hard drives have quick become one of the most powerful and progressive parts of the PC. Tremendous storage capacities and outstanding speed allow unmatched performance-including use as virtual memory. However, PC also depend on the hard drive. Drive problems can prevent a system from booting, and data loss can render weeks (or months) of work inaccessible.
Hard drive interfaces
There are four major interfaces used with hard drives: ST506/412, ESDI, IDE/EIDE, and SCSI. These are older interfaces, and you will almost never encounter them unless working on an early-model i386 or older system.EIDE (Enhanced IDE) drives and interfaces appered in 1949 and have now largely replaced IDE in new systems, though the 40-pin interface is exactly the same. SCSI (Small Computer System Interface) drives are outstanding in server or multitasking systems.
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