Several conventional types of hard disk interfaces

1、 Parallel interface And serial interface.

(1)Parallel interface 。

It refers to the interface for parallel transmission. If there are 0 ~ 90 numbers, 10 transmission lines are used, and each line only needs to transmit 1 digit.

Theoretically, the parallel transmission efficiency is high, but due to the physical reasons on the line, the transmission frequency can not be too high, and the actual transmission speed is not directly proportional to the parallelism, which may be worse.

(2) Serial interface.

It refers to the interface of serial transmission. It is also 0 ~ 90 numbers. It needs to be transmitted 10 times with one transmission line.

Theoretically, the efficiency of serial transmission is not high, but because of its data accuracy and high-frequency support, the transmission speed is high.

(3) Parallel and serial cables (IDE / SATA)

At present, the external interfaces of most computers are replaced by serial interfaces, such as USB, 1394, com, etc. Are serial interfaces.

The external interface of the hard disk is also occupied by the serial interface (SATA / SAS).

2. Hard disk interface type.

Hard disk interface protocols / specifications can be divided into ATA and SCSI. The hard disk using an interface is called XXX hard disk.

(1) ATA interface protocol.

-IDE interface.

IDE interface is also called PATA interface, that is, parallel ATA interface. This interface hard disk is commonly used in previous PCs.

-SATA interface.

SATA (serial ATA) interface serial ATA interface. This kind of hard disk usually has low speed and large capacity. At this stage, personal computers or IOPs require less storage and hard disks using this interface.

-IDE and SATA hard disk interfaces.

(2) SCSI interface protocol.

-SCSI interface.

SCSI is commonly referred to as Parallel interface This interface was also widely used in early computer settings (printers, scanners, etc.). There are few hard disks using this interface now.

-SAS interface.

SAS (serialscsi) interface disk has high speed and high IOPs, which is suitable for the storage of OLTP system.

In addition, SAS interface technology can be compatible with SATA. In other words, if there is a SAS interface on the motherboard, you can connect the SATA hard disk, but not.

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