The best part about this is that the keyboard company likely followed tutorials for building their device drivers and never substituted the default image (which is a fictitious company called Fabrikam):
You probably meant /dev/cdrom which as far as I know is just a link to CD-ROM drive. In case of SATA and SCSI drives it links to /dev/sr(number) and in case of IDE drive to /dev/hd(letter).
Lol the best part about that is, it spawned from floppy disks. It hasn’t changed. And there’s no official docs on why. Instead search results are literally StackOverflow and forum questions on why it’s not a thing.