How to install the hard disk interface of desktop computer

Sata

SATA (serial Advanced Technology attachment) is the abbreviation for Serial ATA, which is currently available SATA-1 and SATA-2 two standards, the corresponding transmission speed is 150mb/s and 300mb/s. SATA is primarily used for PATA interface technology that has replaced bottlenecks. From the speed of this point, SATA in the transmission mode SATA is also more advanced than Pata, has been far away from the PATA hard drive behind. Second, from the data transmission point of view, Sata than Pata anti-interference ability.

SATA-1 has been widely used, its maximum data transmission rate of 150MBPS, signal line up to 1 meters long. SATA is generally a point-to-point connection, that is, a SATA interface connected to the motherboard, the other end directly connected to the hard drive, no other device can share this data line, and parallel ATA allows this (each data cable can connect 1-2 devices), There is therefore no need to set the master and the disk as parallel ATA hard drives.

In addition, SATA has the hot plug function is not comparable to PATA, the use of this feature can be more convenient to build a disk array. Serial data lines due to only the use of four-pin structure, so compared with the mouth installed more convenient, more conducive to reducing the cable in the chassis, conducive to heat dissipation.

Scsi

SCSI (Small Computer system Interface) is a kind of storage cell interface model specially designed for small computer system, which can carry out dynamic division of work for multiple devices in the computer, and can be easily distributed and completed dynamically for multiple tasks required by the system.

The SCSI specification has grown to today and is the sixth generation technology, from SCSI (8bit), Wide scsi (8bit), Ultra Wide scsi (8bit/16bit), Ultra Wide SCSI 2 (16bit), Ultra 160 scsi (16bit) to today's ultra-1.2mb/s SCSI, the speed from the 320mb/s has a qualitative leap in the current. The ultra-320mb/s SCSI interface is used by the current mainstream SCSI hard drives to provide the transfer speed of the interface.

SCSI hard disks also have a SCA2 interface (80-pin) that specifically supports hot-plug technology, which can be easily plugged in by using the SCSI backplane. Hot-swappable features are now almost essential in workgroup and departmental servers.

　Experience Summary:

Because SCSI has low CPU usage, multitasking, high efficiency, many connection devices, long connection distance and other advantages, for most server applications, SCSI hard drives are recommended and the latest ULTRA320 SCSI controller is adopted; SATA drives also have hot-swappable capabilities and can be well scalable on the interface, such as using Scsi-sata, Fc-sata conversion interfaces, and SATA port multiplier in a rack-top server to provide better flexibility than SCSI. For low-end small server applications, you can use the latest SATA hard drives and controllers.

After determining the interface and type of the hard disk, we should focus on the above mentioned technical indicators affecting the performance of the hard disk, according to the speed, single disc capacity, average seek time, caching and other factors, combined with the capital budget, select the most appropriate cost-effective hard disk program.