Small computer system interface SCSI is an ANSI standard that is a parallel interface standard for Apple Mac computers, PCS, and many UNIX systems to connect to computers and peripherals. The SCSI interface provides a faster data transfer rate than standard serial and parallel ports. In addition, people can connect multiple devices in a single SCSI port. The SCSI series includes: SCSI-1, SCSI-2, SCSI-3, and SCSI (SAS: Standard Serial Attached SCSI) recently recognized standard serial connection.
SCSI-1
SCSI-1 is the initial version of SCSI, which is now outdated. SCSI-1 has an 8-bit bus with a data transfer rate of 4 Mbps.
SCSI-2
SCSI-2 is based on CCS-based SCSI-1 improved versions, which are 18 minimum command groups running on all product hardware. With the support of FAST SCSI, SCSI-2 is improved on the basis of the original SCSI-1, and supports 16-bit Wide SCSI version. Command queuing features enable the SCSI device to execute commands in the most effective order. The FAST SCSI's transmission rate is 10 MB / sec, and when the 16-bit bus is connected, its transmission rate is 20 Mb / sec (Fast-Wide SCSI).
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