What Is a Small Computer System Interface?

Small computer system interface (SCSI) is a stand-alone processor standard for a system-level interface between a computer and its peripheral devices (hard disk, floppy drive, optical drive, printer, scanner, etc.) The SCSI standard defines commands, communication protocols, and electrical characteristics of entities (in OSI terms, it occupies the physical layer, link layer, socket layer, and application layer). The largest part of applications is on storage devices (such as hard disks, tape drives ); However, the devices that SCSI can connect to include scanners, optical devices (like CDs, DVDs), printers, etc. The SCSI commands list the supported devices SCSI peripherals. In theory, SCSI cannot connect all devices, so there is a parameter of "1Fh-unknown or no device type".

Small Computer System Interface

The small computer system interface (SCSI, S mall Comper System I nterface) is a

The original SCSI standard had a maximum synchronous transfer rate of 5MB / s (SCSI-1, aka Narrow

Besides SCSI,

1. SCSI can support multiple devices, SCSI-2 (FastSCSI) can connect up to 7 SCSI devices, W

The last SCSI device in the SCSI chain uses a terminator, and intermediate devices do not need a terminator. Once the terminator is used by the intermediate device, the SCSI card cannot find future SCSI devices. And if the last device does not use a terminator, SCSI will not work properly. The terminator is composed of resistors and is located at the end of the SCSI bus. It is used to reduce the signals that affect each other and keep the voltage on the SCSI chain constant.

Most SCSI devices are built-in terminators and use one

Each SCSI device in the system must have its own unique ID (identification number). On an 8-bit bus, this number is 0 to 7; on a 16-bit bus, this number is from 0 to 15. The SCSIAdapter system default ID is 7. This ID can be set by a jumper located on the front of the device. For hard drives it is located on the front or back of the drive.