Article Summary: This article provides information on "Replacement SCSI hard drive not detected by SCSI controller".
System user replaced both SCSI hard drives in a system and the hard drive controller only sees one drive.
Small Computer System Interface (SCSI) hard drives ship with the same SCSI ID jumper setting (Usually SCSI ID 0 or 1 depending on the drive model).
When installing the drive, it is important to note the SCSI IDs of all existing SCSI devices in the SCSI chain and ensure that all devices are set to unique SCSI ID's.
Generally, the SCSI controller is defaulted to SCSI ID 7, and the normal SCSI ID for a pair of RAID Drives is SCSI 0 and SCSI 1. It is important for System Users to understand that the IDs for the drives may need to be changed from the factory default and this information should be documented for future reference.
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