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SCSI Interface Overview
ANSI SCSI Bus Standards
Cabling and Connectors
The Seagate LTO drives are designed to operate with the Small Computer System
Interface (SCSI) bus. This chapter discusses SCSI bus operation as it pertains to
drive functions.
SCSI is a standard interface established to support peripheral equipment such as
printers, tape drives, magnetic disks, optical disks for microcomputers and other
computer systems. The SCSI bus can support up to sixteen devices consisting of
any multiple of host adapters and peripheral devices.
The Seagate LTO drives comply with SCSI-2 and SCSI-3 specifications. In a few
cases, vendor unique features are available. These features are compatible with the
SCSI standards.
The interface is a sixteen-port daisy-chained bus using twenty-seven signal lines:
eighteen data-bit signal lines and nine control lines. The eighteen data-bit lines are
made up of two pairs of eight data signal lines and one parity bit line. The remaining
nine lines provide control and status signals to coordinate data transfer operations
between the host controller and the selected drive.
The drives have an internal SCSI controller integrated into the drive electronics.
Each device ID on the SCSI bus may drive up to 16 logical units (LUN). Seagate
LTO drives support only LUN 0.
In addition to the information presented in this manual, we recommend that you
review the applicable SCSI-3 standards before writing host software drivers. Also,
see the conformance statements, which are given in the Product Description Manual
for the each model of LTO drive.
The cabling requirements and pin assignments for the SCSI connector for the
internal drive models are given in the respective installation guide and Product
Description Manual for each model of LTO drive.
LTO SCSI Interface Manual
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