This provides a simpler interface with the computer

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Unformatted text preview: er to act as an intermediary between the device and the rest of the computer system. On some computers, the controller is an integral part of the computer's main motherboard. On others, the controller is an expansion board that connects to the system bus by plugging into one of the computer's expansion slots. In order that devices manufactured by independent vendors can be used with different computer manufacturers, it is important that the controllers follow some drive interfacing standard. The four commonly used drive interface standards are: 1. Integrated Drive Electronics (IDE). IDE incorporates much of the intelligence of the controller into the drive itself. Because most of their controlling electronics are on the drive itself, IDE controllers are small, simple cards that do little more than providing an IDE drive with a place to plug into the computer's bus. In fact, some computer manufacturers build IDE support right into their motherboards. IDE provides datatransfer rates of about 1 Megabytes per second under ideal conditions. 2. Enhanced Small Device Interface (ESDI). Like IDE, ESDI (pronounced "es-dee") also incorporates much of the intelligence of the controller into the drive. This provides a simpler interface with the computer and leads to faster and more reliable operation. An ESDI controller can theoretically address up to 1 terabyte (10 12 bytes) of disk space and can reliably transfer up to 3 Megabytes per second. 3. Intelligent Peripheral Interface-level 3 (IPI-3). IPI-3 is used in minicomputers and mainframe systems for interfacing faster, larger disks (having diameter of 8 inches or more) with the main computer system. It allows faster data transfer from the disk to the computer's memory as compared to IDE or ESDI. 4. Small Computer System Interface (SCSI). In case of IDE, ESDI and IPI-3, a separate device controller is required in the computer system for each type of device that has to be connected to it. SCSI (pronounced "scuzzy") is an interesting and important variation of the separate device contr...
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This document was uploaded on 04/07/2014.

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