disk device names
The names Linux gives disks under /dev, such as sda for the first SCSI-layer disk and sr0 for the first optical drive.
In more detail
The letter after sd follows detection order, so it can change when disks are added; that is why /etc/fstab uses UUIDs or labels. Very old kernels named IDE disks hda, hdb and so on.
Related terms
- SCSI — Small Computer System Interface: a family of standards for attaching and commanding disks, whose Linux disk layer also drives SATA and USB disks.
- NVMe — Non-Volatile Memory Express: the interface for fast solid state drives plugged straight into the PCI Express bus.
- UUID — A 128-bit identifier, usually written as 32 hexadecimal digits in five groups, designed to be unique without any central coordination.
Taught in
- Hardware: What The Kernel Sees, What It Loads — LPIC-1 Linux Administrator (101-500 and 102-500) Exam Prep