Linux Guide:Drive naming conventions
From AnarchismToday.org Wiki
To refer to a drive on your computer, or any device for that matter, Linux uses what are called "device nodes." Device nodes are basically files that represent devices on your system, and are usually stored in /dev.
A device node that refers to an entire drive will usually be named something like /dev/hda, for the first IDE drive, /dev/hdb for the second, etc. For SCSI, or SATA which uses the SCSI device nodes, they will usually be /dev/sda and /dev/sdb, respectively.
Linux also uses these device nodes to reference specific partitions on a drive. For example, Linux will probably refer to the third partition on your first IDE drive as /dev/hda3, and the first partition on your second SCSI or SATA drive, will probably be /dev/sdb1. Understanding the naming scheme is quite important for working with drives and partitions in Linux.




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