Several common connector interfaces

Several commonly used connector interface
1, IDE interface (commonly used in hard disk interface)
IDE's full English name is "Integrated Drive Electronics", that is, "electronic integrated drive", which is intended to refer to the "hard disk controller It is meant to refer to the hard disk drive that integrates the "hard disk controller" and "disk body" together. Mostly used in household products, but also partially used in servers.
IDE interface advantages: low price, compatibility, cost-effective IDE interface disadvantages: slow data transfer speed, cable length is too short, less connected devices, does not support hot plugging Development history: Early IDE interface has two transmission modes, one is PIO (Programming I/O) mode, the other is DMA (Direct Memory Access). The other is DMA (Direct Memory Access). Although the DMA mode takes up less system resources, it requires additional drivers or settings, so it was accepted to a lesser extent. Later on, when the speed requirement became higher and higher, DMA mode began to be directly supported by the operating system due to its better execution efficiency, and vendors introduced faster and faster transfer speed standards for DMA mode. And from Intel's 430TX chipset began to provide support for Ultra DMA 33, providing a maximum of 33MB/sec data transfer rate, and later quickly developed to ATA 66, ATA 100 and Maxtor proposed ATA 133 standard, respectively, to provide 66MB/sec, 100MB/sec, Maxtor itself to use the ATA 133 standard, and Hitachi (Hitachi) (100MB/sec). The ATA 133 standard is adopted by Maxtor itself, while ATA 100 standard is adopted by Hitachi (IBM), Seagate and Western Digital, and only VIA, SIS, ALi and nVidia provide support for this standard among chipset manufacturers, and Intel only supports the ATA 100 standard among chipset manufacturers. Various IDE standards are very good downward compatibility, such as ATA 133 compatible with ATA 66/100 and Ultra DMA33, while ATA 100 is also compatible with Ultra DMA 33/66. Summarize: IDE represents a type of hard disk, but in practice, people are also accustomed to IDE to call the earliest emergence of IDE type of hard disk ATA-1, this type of interface with the development of interface technology. Type of interface with the development of interface technology has been eliminated, and the subsequent development of more types of hard disk interfaces, such as ATA, Ultra ATA, DMA, Ultra DMA and other interfaces belong to IDE hard disk. The current hardware interface has been shifted to SATA, IDE interface will sooner or later exit the stage. 2, SCSI interface (commonly used in hard disk interface) SCSI English full name "Small Computer System Interface" (small computer system interface), is completely different from the IDE (ATA) interface, IDE interface is the standard interface of the ordinary PC, and the SCSI is not specifically for hard disk. SCSI is not specifically designed for hard disk interface, is a widely used in small machines on the high-speed data transfer technology. SCSI higher price makes it difficult to popularize as IDE hard disk, so SCSI hard disk is mainly used in the middle and high-end servers and high-end workstations.

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