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The four numbers represent a SCSI address, often referred to as H:C:T:L. The four components are host, channel (or bus), target, and LUN. With drives you’re likely to encounter on an end-user system (SATA, consumer NVMe, USB), the channel, target, and LUN will all be zero. The host number will depend on which port the drive is connected to, and how it’s ...

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