what’s block device

content

The block device provides access to the physical storage

Claude

less precise:

block devices are just raw storage hardware more precise:
block devices are the software interface of physical storage
it’s those /dev/sda and the like that appear on the system when a physical device plugged in into the system
in a wider, more general sense, block devices refer to physical devices connected to the system
in a more narrow, more specific sense, block devices are interfaces (created by linux) of physical devices, for the system to interact with them.