Classification and comparison of hard disk interfaces

1.IDE (Integrated drive Electronics, electronic integrated drives), more common. The IDE hard drive has the following three types of transmission modes: PIO (programmed I/O) mode, DMA (driect Memory Access) mode, Ultra DMA (short UDMA) mode.

2.SCSI (Small computer system Interface, small computer system interface), is a completely different interface with the IDE (ATA), the IDE interface is the standard interface of the ordinary PC, and SCSI is not specifically designed for the hard disk interface, is a kind of high-speed data transmission technology widely used in small-sized machines. The SCSI interface has a wide range of applications, multitasking, high bandwidth, low CPU usage, and hot plug, and so on, but the high price makes it difficult to use as IDE hard disk, so the SCSI hard disk is mainly used in medium and high-end servers and high-end workstations.

3. Fibre Channel.

4.SATA (Serial ATA, serial drive), is the future and now the main trend of PC hard disk. The Serial ATA uses a serial connection, the Serial ATA bus uses an embedded clock signal, has a stronger error correction capability, the biggest difference compared with the past is that the transmission instruction (not just the data) can be checked, if the error is automatically corrected, which greatly improves the reliability of data transmission.

The 5.SAS (Serial attached SCSI), serial-attached SCSI, is a new generation of SCSI technology that is the same as the current popular Serial ATA (SATA) hard drives, with serial technology for higher transmission speeds and improved internal space by shortening the wiring. SAS is a new interface developed after the parallel SCSI interface. This interface is designed to improve the performance, availability, and scalability of storage systems and to provide compatibility with SATA drives.

SATA drives feature a new design structure, fast data transfer, space saving, and a number of advantages over IDE hard drives:

1.SATA drives are faster than IDE hard drives. SATA can provide peak transfer rates for 150mb/s. The future will be up to a-MB/s. We will get a transfer rate that is nearly 10 times times faster than the IDE drive.
2. Relative to the IDE hard disk PATA40 PIN data cable, SATA cable Small and thin, transmission distance, can extend to 1 meters, making installation equipment and in-machine wiring easier. The small size of the connector, which effectively improves the air flow inside the computer, also improves cooling in the chassis.
3. Lower power consumption compared to IDE hard drive system. A SATA hard drive can operate with a voltage of 500 mv.
4.SATA can be backwards compatible with PATA devices by using a multi-purpose chipset or serial-parallel converters. Because SATA and PATA can use the same drive, there is no need to upgrade or otherwise change the operating system.
5.SATA does not need to set the master/slave jumper. The BIOS will number it in 1, 2, 3 order. This depends on which SATA connector the drive is connected to (easy to install). The IDE hard drive needs to be set up with jumpers to set the master and slave disks.
The 6.SATA also supports hot-swappable and can be used like a USB stick. The IDE hard drive does not support hot swapping.

Classification and comparison of hard disk interfaces