SCSI-2也称为Fast－SCSI，传输速率为10MB／s。 后采用扩展总线宽度来增加数据流量的方式，提高整 体传输速率，于是SCSI－2规定了16位、32位数据总 线，使传输速率进一步提高为20MB／S，也就是Wide －SCSI，或是称作Fast SCSI－2。 Wide－SCSI采用4 位定址，使可连接的设备达到了15个。在接口电缆上， 为兼容SCSI－l所使用的A电缆，SCSI－2标准在A 电缆的基础上增加一条68pin的扁平电缆，称为B电 缆。目前还有不少SCSI的CD－ROM、CD－R、CD－ RW还是使用SCSI－2界面。-SCSI-2, also known as Fast - SCSI, the transmission rate to 10 MB / s. Following the expansion bus width to increase the flow of data as a means of raising the overall transmission rate, So SCSI-2 provides 16 and 32-bit data bus. make further enhance the transmission rate of 20 MB / S, is Wide - SCSI, or called Fast SCSI-2. Wide - SCSI used four addressable so that the equipment can be connected to a 15. The interface cable, for compatibility with SCSI-1 used by the A cable, SCSI-2 standard A cable on the basis of an increase in the 68 pin flat cable, known as B cable. There are still a lot of SCSI CD-ROM, CD-R, CD-RW or use SCSI-2 interface.