SCSI (Small Computer System Interface)
The Small Computer System Interface (SCSI) standard is used mainly in servers or workstations older generation. This is to provide an interface between the disk drives, such as Hard drives, and the system bus. Contrary to the ATA / IDE more than 2 devices per port can be used.
For the use of peripheral devices with SCSI connection, a host bus adapter (HBA ) is required, which controls the complete process. The HBA can be integrated on the motherboard, but is often retrofitted by a plug-in card. First and foremost, SCSI is used for connecting hard drives or tape drives. However, theoretically any device SCSI use because the default is device independent. The cost factor is initially greater with SCSI devices.
This is mainly because that the numbers are significantly lower than for IDE devices. However, SCSI drives are also designed for continuous operation and therefore particularly suitable for servers. Therefore motherboards for home computers usually do not have a SCSI connection. The standard was developed by 2002 and ended with the release Ultra-320, which allows a transfer rate of up to 320MB/s. A further improvement was not performed because the industry since then sets the new standard SAS. The iSCSI support is often listed on NAS devices refers to the use of the SCSI protocol over TCP (ie the network).