Each such driver or facility emits diagnostic information in its own chosen format, and generally includes all of the most important technical details, in a dense and arcane notation. The manual page associated with the device driver will sometimes document the message format. For example, device name (SCSI direct access ) is a commonly seen device name associated with USB thumb drives. at the command line—without the trailing number—will bring up documentation for this driver class on many systems. Even if the precise format of the lines written to the system buffer are not described here, the parameters of interest are usually defined, though you might need to further peruse related manual pages (listed at the bottom of a traditional man page) for a complete overview spanning various hardware abstraction layers.