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The Hard Disk Interface Supported By The RAID Card
- Sep 18, 2018 -

The interface refers to the hard disk interface supported by the RAID card. Currently, there are three main types: IDE interface, SCSI interface, and SATA interface.

IDE interface:

IDE is called  Integrated Drive Electronics , which is the  electronic integrated drive . It is intended to refer to the hard disk drive that integrates the  hard disk controller  with the  disk . The integration of the disk and the controller reduces the number and length of cables on the hard disk interface, the reliability of data transmission is enhanced, and the hard disk is made easier, because the hard disk manufacturer does not need to worry about whether its hard disk is Compatible with controllers from other manufacturers, it is more convenient for users to install them. The interface technology of IDE has been continuously developed since its birth, and its performance has been continuously improved. Its low price and strong compatibility have created an irreplaceable position for other types of hard disks.

IDE represents a type of hard disk, but in practical applications, people are accustomed to use IDE to call the earliest IDE type hard disk ATA-1. This type of interface has been eliminated with the development of interface technology, and its Later development branches out more types of hard disk interfaces, such as ATA, Ultra ATA, DMA, Ultra DMA and other interfaces are IDE hard drives. In addition, since the IDE port is a parallel interface, in order to distinguish it from the SATA port hard disk, the IDE port hard disk is also called a PATA port hard disk.

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SCSI interface:

SCSI is called  Small Computer System Interface , which is a completely different interface from IDE. IDE interface is the standard interface of ordinary PC, and SCSI is not an interface specially designed for hard disk. It is a wide range. High-speed data transmission technology applied to minicomputers. The SCSI interface has the advantages of wide application range, multi-tasking, large bandwidth, low CPU usage, and support for hot swapping. However, the high price makes it difficult to popularize like an IDE hard disk. Therefore, SCSI hard disks are mainly used in medium and high-end. Servers and high-end workstations. Compared with ordinary IDE hard disks, SCSI hard disks have many advantages: the interface speed is fast, and because it is mainly used for servers, the performance of the hard disk itself is relatively high, the hard disk speed is fast, the cache capacity is large, the CPU usage is low, and the scalability is much better. IDE hard drive and support hot swap.

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SATA interface:

The hard disk using SATA (Serial ATA) port is also called serial port hard disk, which is the trend of PC hard disk in the future. In 2001, the Serial ATA Committee consisting of Intel, APT, Dell, IBM, Seagate and Maxtor officially established the Serial ATA 1.0 specification. In 2002, although Serial ATA related equipment has not yet been officially launched, Serial The ATA committee has pre-empted the Serial ATA 2.0 specification. Serial ATA adopts serial connection mode. Serial ATA bus uses embedded clock signal and has stronger error correction capability. Compared with the past, the biggest difference is that it can check the transmission command (not just data). The error is automatically corrected, which greatly improves the reliability of data transmission. The serial interface also has the advantages of simple structure and hot swap support.

Serial hard disk is a new type of hard disk interface that is completely different from parallel ATA. It is well known for transmitting data in serial mode. Compared to parallel ATA, it has a lot of advantages. First, Serial ATA transfers data in a serial serial fashion, transferring only 1 bit of data at a time. This can reduce the number of pins on the SATA interface, making the number of connecting cables less and more efficient. In fact, Serial ATA does all the work with just four pins, which are used to connect cables, connect ground, send data, and receive data, while reducing the system's power consumption and system complexity. Secondly, Serial ATA has a higher starting point and greater development potential. Serial ATA 1.0 defines a data transfer rate of 150MB/s, which is the highest data of 133MB/s than the latest parallel ATA (ATA/133). The transmission rate is still high, and the data transfer rate of Serial ATA 2.0 will reach 300MB/s, and finally SATA will achieve the highest data transfer rate of 600MB/s.

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When RAID technology was introduced, it was based on the SCSI interface. Because of its high cost, it was mainly targeted at high-end applications such as servers. Ordinary users simply do not have RAID. With the popularity of computers, this has led to the unprecedented prosperity of PC computers. Correspondingly, under the market, the price of IDE interface devices for PC computers has been greatly reduced, and the performance has been greatly improved. In view of this, RAID technology began to be ported to the IDE interface, and a RAID application based on IDE interface, called IDE RAID, was introduced. RAID applications based on SCSI interfaces are called SCSI RAID. Compared to SCSI RAID, IDE RAID has a very low price and performance that is not inferior. Correspondingly, IDE RAID solutions are cost-effective compared to SCSI RAID. Therefore, since the launch of IDE RAID, it has been widely welcomed by ordinary PC users and general commercial applications.

Of course, IDE RAID also has its shortcomings, such as the CPU usage and the number of connected devices can not be compared with SCSI RAID. At the same time, IDE RAID only supports RAID0, RAID1 and RAID0+1, and the performance is better than SCSI RAID. Slightly inferior, so high-performance computer applications are still based on SCSI RAID. SATA RAID is just born RAID mode, it is similar to IDE RAID, the biggest advantage is low cost, and other aspects are close to IDE RAID.