A small computer systems interface (SCSI) is a standard for connecting peripheral devices to a personal computer. It can connect up to 16 peripheral devices utilizing a single bus, including one host adapter, depending on the standard. For devices like CD-ROM drives, scanners, DVD drives, and CD writers, SCSI is utilized to improve performance, deliver faster data transfer transmission, and provide bigger expansion. RAID, servers, high-performance PCs, and storage area networks are all common uses for SCSI. A controller is responsible for transporting data between devices and the SCSI bus in SCSI. It is either built into the motherboard or installed as a host adapter in a motherboard expansion slot. SCSI basic input/output system, a tiny chip that provides the essential software to access and operate devices, is also included in the controller. A number between 0 and 1 must be allocated to each device on a parallel SCSI bus. On a narrow bus, the numbers 0 and 7; on a bigger bus, the numbers 0 and 15. SCSI ID is the name for this number. With the usage of serial storage architecture initiators, newer serial SCSI IDs, such as serial attached SCSI (SAS), assign a 7-bit number automatically.