What are the SCSI Types?
SCSI-1 was standardized by ANSI in 1986. The initial implementation of SCSI (now called SCSI-1) was designed primarily for Narrow (8-bit), single-ended, synchronous or asynchronous disk drives and was very limited relative to today’s SCSI. It includes synchronous and asynchronous data transfers at speeds up to 5 Mbytes/sec. The standard connectors are the familiar 50-pin, female, low-density non-shielded connector for internal wiring and the equally familiar 50-pin, male, shielded “centronics” type connector for external wiring SCSI-2: An update that became an official standard in 1994, a key component of SCSI-2 was the inclusion of the Common Command Set (CCS) — the 18 commands considered an absolute necessity for support of any SCSI device. You also had the option to double the clock speed from 5 MHz to 10 MHz (Fast SCSI), double the bus width from 8 bits to 16 bits and increase the number of devices to 15 (Wide SCSI), or do both (Fast/Wide SCSI). Finally, SCSI-2 added command queui
